!function(e){
  var _global = typeof window === 'undefined' ? global : window;
  _global.io = e();
}(function(){var define,module,exports;return (function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);throw new Error("Cannot find module '"+o+"'")}var f=n[o]={exports:{}};t[o][0].call(f.exports,function(e){var n=t[o][1][e];return s(n?n:e)},f,f.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(_dereq_,module,exports){

  module.exports = _dereq_('./lib/');

},{"./lib/":2}],2:[function(_dereq_,module,exports){

  /**
   * Module dependencies.
   */

  var url = _dereq_('./url');
  var parser = _dereq_('socket.io-parser');
  var Manager = _dereq_('./manager');
  var debug = _dereq_('debug')('socket.io-client');

  /**
   * Module exports.
   */

  module.exports = exports = lookup;

  /**
   * Managers cache.
   */

  var cache = exports.managers = {};

  /**
   * Looks up an existing `Manager` for multiplexing.
   * If the user summons:
   *
   *   `io('http://localhost/a');`
   *   `io('http://localhost/b');`
   *
   * We reuse the existing instance based on same scheme/port/host,
   * and we initialize sockets for each namespace.
   *
   * @api public
   */

  function lookup(uri, opts) {
    if (typeof uri == 'object') {
      opts = uri;
      uri = undefined;
    }

    opts = opts || {};

    var parsed = url(uri);
    var source = parsed.source;
    var id = parsed.id;
    var io;

    if (opts.forceNew || opts['force new connection'] || false === opts.multiplex) {
      debug('ignoring socket cache for %s', source);
      io = Manager(source, opts);
    } else {
      if (!cache[id]) {
        debug('new io instance for %s', source);
        cache[id] = Manager(source, opts);
      }
      io = cache[id];
    }

    return io.socket(parsed.path);
  }

  /**
   * Protocol version.
   *
   * @api public
   */

  exports.protocol = parser.protocol;

  /**
   * `connect`.
   *
   * @param {String} uri
   * @api public
   */

  exports.connect = lookup;

  /**
   * Expose constructors for standalone build.
   *
   * @api public
   */

  exports.Manager = _dereq_('./manager');
  exports.Socket = _dereq_('./socket');

},{"./manager":3,"./socket":5,"./url":6,"debug":10,"socket.io-parser":44}],3:[function(_dereq_,module,exports){

  /**
   * Module dependencies.
   */

  var url = _dereq_('./url');
  var eio = _dereq_('engine.io-client');
  var Socket = _dereq_('./socket');
  var Emitter = _dereq_('component-emitter');
  var parser = _dereq_('socket.io-parser');
  var on = _dereq_('./on');
  var bind = _dereq_('component-bind');
  var object = _dereq_('object-component');
  var debug = _dereq_('debug')('socket.io-client:manager');
  var indexOf = _dereq_('indexof');
  var Backoff = _dereq_('backo2');

  /**
   * Module exports
   */

  module.exports = Manager;

  /**
   * `Manager` constructor.
   *
   * @param {String} engine instance or engine uri/opts
   * @param {Object} options
   * @api public
   */

  function Manager(uri, opts){
    if (!(this instanceof Manager)) return new Manager(uri, opts);
    if (uri && ('object' == typeof uri)) {
      opts = uri;
      uri = undefined;
    }
    opts = opts || {};

    opts.path = opts.path || '/socket.io';
    this.nsps = {};
    this.subs = [];
    this.opts = opts;
    this.reconnection(opts.reconnection !== false);
    this.reconnectionAttempts(opts.reconnectionAttempts || Infinity);
    this.reconnectionDelay(opts.reconnectionDelay || 1000);
    this.reconnectionDelayMax(opts.reconnectionDelayMax || 5000);
    this.randomizationFactor(opts.randomizationFactor || 0.5);
    this.backoff = new Backoff({
      min: this.reconnectionDelay(),
      max: this.reconnectionDelayMax(),
      jitter: this.randomizationFactor()
    });
    this.timeout(null == opts.timeout ? 20000 : opts.timeout);
    this.readyState = 'closed';
    this.uri = uri;
    this.connected = [];
    this.encoding = false;
    this.packetBuffer = [];
    this.encoder = new parser.Encoder();
    this.decoder = new parser.Decoder();
    this.autoConnect = opts.autoConnect !== false;
    if (this.autoConnect) this.open();
  }

  /**
   * Propagate given event to sockets and emit on `this`
   *
   * @api private
   */

  Manager.prototype.emitAll = function() {
    this.emit.apply(this, arguments);
    for (var nsp in this.nsps) {
      this.nsps[nsp].emit.apply(this.nsps[nsp], arguments);
    }
  };

  /**
   * Update `socket.id` of all sockets
   *
   * @api private
   */

  Manager.prototype.updateSocketIds = function(){
    for (var nsp in this.nsps) {
      this.nsps[nsp].id = this.engine.id;
    }
  };

  /**
   * Mix in `Emitter`.
   */

  Emitter(Manager.prototype);

  /**
   * Sets the `reconnection` config.
   *
   * @param {Boolean} true/false if it should automatically reconnect
   * @return {Manager} self or value
   * @api public
   */

  Manager.prototype.reconnection = function(v){
    if (!arguments.length) return this._reconnection;
    this._reconnection = !!v;
    return this;
  };

  /**
   * Sets the reconnection attempts config.
   *
   * @param {Number} max reconnection attempts before giving up
   * @return {Manager} self or value
   * @api public
   */

  Manager.prototype.reconnectionAttempts = function(v){
    if (!arguments.length) return this._reconnectionAttempts;
    this._reconnectionAttempts = v;
    return this;
  };

  /**
   * Sets the delay between reconnections.
   *
   * @param {Number} delay
   * @return {Manager} self or value
   * @api public
   */

  Manager.prototype.reconnectionDelay = function(v){
    if (!arguments.length) return this._reconnectionDelay;
    this._reconnectionDelay = v;
    this.backoff && this.backoff.setMin(v);
    return this;
  };

  Manager.prototype.randomizationFactor = function(v){
    if (!arguments.length) return this._randomizationFactor;
    this._randomizationFactor = v;
    this.backoff && this.backoff.setJitter(v);
    return this;
  };

  /**
   * Sets the maximum delay between reconnections.
   *
   * @param {Number} delay
   * @return {Manager} self or value
   * @api public
   */

  Manager.prototype.reconnectionDelayMax = function(v){
    if (!arguments.length) return this._reconnectionDelayMax;
    this._reconnectionDelayMax = v;
    this.backoff && this.backoff.setMax(v);
    return this;
  };

  /**
   * Sets the connection timeout. `false` to disable
   *
   * @return {Manager} self or value
   * @api public
   */

  Manager.prototype.timeout = function(v){
    if (!arguments.length) return this._timeout;
    this._timeout = v;
    return this;
  };

  /**
   * Starts trying to reconnect if reconnection is enabled and we have not
   * started reconnecting yet
   *
   * @api private
   */

  Manager.prototype.maybeReconnectOnOpen = function() {
    // Only try to reconnect if it's the first time we're connecting
    if (!this.reconnecting && this._reconnection && this.backoff.attempts === 0) {
      // keeps reconnection from firing twice for the same reconnection loop
      this.reconnect();
    }
  };


  /**
   * Sets the current transport `socket`.
   *
   * @param {Function} optional, callback
   * @return {Manager} self
   * @api public
   */

  Manager.prototype.open =
      Manager.prototype.connect = function(fn){
        debug('readyState %s', this.readyState);
        if (~this.readyState.indexOf('open')) return this;

        debug('opening %s', this.uri);
        this.engine = eio(this.uri, this.opts);
        var socket = this.engine;
        var self = this;
        this.readyState = 'opening';
        this.skipReconnect = false;

        // emit `open`
        var openSub = on(socket, 'open', function() {
          self.onopen();
          fn && fn();
        });

        // emit `connect_error`
        var errorSub = on(socket, 'error', function(data){
          debug('connect_error');
          self.cleanup();
          self.readyState = 'closed';
          self.emitAll('connect_error', data);
          if (fn) {
            var err = new Error('Connection error');
            err.data = data;
            fn(err);
          } else {
            // Only do this if there is no fn to handle the error
            self.maybeReconnectOnOpen();
          }
        });

        // emit `connect_timeout`
        if (false !== this._timeout) {
          var timeout = this._timeout;
          debug('connect attempt will timeout after %d', timeout);

          // set timer
          var timer = setTimeout(function(){
            debug('connect attempt timed out after %d', timeout);
            openSub.destroy();
            socket.close();
            socket.emit('error', 'timeout');
            self.emitAll('connect_timeout', timeout);
          }, timeout);

          this.subs.push({
            destroy: function(){
              clearTimeout(timer);
            }
          });
        }

        this.subs.push(openSub);
        this.subs.push(errorSub);

        return this;
      };

  /**
   * Called upon transport open.
   *
   * @api private
   */

  Manager.prototype.onopen = function(){
    debug('open');

    // clear old subs
    this.cleanup();

    // mark as open
    this.readyState = 'open';
    this.emit('open');

    // add new subs
    var socket = this.engine;
    this.subs.push(on(socket, 'data', bind(this, 'ondata')));
    this.subs.push(on(this.decoder, 'decoded', bind(this, 'ondecoded')));
    this.subs.push(on(socket, 'error', bind(this, 'onerror')));
    this.subs.push(on(socket, 'close', bind(this, 'onclose')));
  };

  /**
   * Called with data.
   *
   * @api private
   */

  Manager.prototype.ondata = function(data){
    this.decoder.add(data);
  };

  /**
   * Called when parser fully decodes a packet.
   *
   * @api private
   */

  Manager.prototype.ondecoded = function(packet) {
    this.emit('packet', packet);
  };

  /**
   * Called upon socket error.
   *
   * @api private
   */

  Manager.prototype.onerror = function(err){
    debug('error', err);
    this.emitAll('error', err);
  };

  /**
   * Creates a new socket for the given `nsp`.
   *
   * @return {Socket}
   * @api public
   */

  Manager.prototype.socket = function(nsp){
    var socket = this.nsps[nsp];
    if (!socket) {
      socket = new Socket(this, nsp);
      this.nsps[nsp] = socket;
      var self = this;
      socket.on('connect', function(){
        socket.id = self.engine.id;
        if (!~indexOf(self.connected, socket)) {
          self.connected.push(socket);
        }
      });
    }
    return socket;
  };

  /**
   * Called upon a socket close.
   *
   * @param {Socket} socket
   */

  Manager.prototype.destroy = function(socket){
    var index = indexOf(this.connected, socket);
    if (~index) this.connected.splice(index, 1);
    if (this.connected.length) return;

    this.close();
  };

  /**
   * Writes a packet.
   *
   * @param {Object} packet
   * @api private
   */

  Manager.prototype.packet = function(packet){
    debug('writing packet %j', packet);
    var self = this;

    if (!self.encoding) {
      // encode, then write to engine with result
      self.encoding = true;
      this.encoder.encode(packet, function(encodedPackets) {
        for (var i = 0; i < encodedPackets.length; i++) {
          self.engine.write(encodedPackets[i]);
        }
        self.encoding = false;
        self.processPacketQueue();
      });
    } else { // add packet to the queue
      self.packetBuffer.push(packet);
    }
  };

  /**
   * If packet buffer is non-empty, begins encoding the
   * next packet in line.
   *
   * @api private
   */

  Manager.prototype.processPacketQueue = function() {
    if (this.packetBuffer.length > 0 && !this.encoding) {
      var pack = this.packetBuffer.shift();
      this.packet(pack);
    }
  };

  /**
   * Clean up transport subscriptions and packet buffer.
   *
   * @api private
   */

  Manager.prototype.cleanup = function(){
    var sub;
    while (sub = this.subs.shift()) sub.destroy();

    this.packetBuffer = [];
    this.encoding = false;

    this.decoder.destroy();
  };

  /**
   * Close the current socket.
   *
   * @api private
   */

  Manager.prototype.close =
      Manager.prototype.disconnect = function(){
        this.skipReconnect = true;
        this.backoff.reset();
        this.readyState = 'closed';
        this.engine && this.engine.close();
      };

  /**
   * Called upon engine close.
   *
   * @api private
   */

  Manager.prototype.onclose = function(reason){
    debug('close');
    this.cleanup();
    this.backoff.reset();
    this.readyState = 'closed';
    this.emit('close', reason);
    if (this._reconnection && !this.skipReconnect) {
      this.reconnect();
    }
  };

  /**
   * Attempt a reconnection.
   *
   * @api private
   */

  Manager.prototype.reconnect = function(){
    if (this.reconnecting || this.skipReconnect) return this;

    var self = this;

    if (this.backoff.attempts >= this._reconnectionAttempts) {
      debug('reconnect failed');
      this.backoff.reset();
      this.emitAll('reconnect_failed');
      this.reconnecting = false;
    } else {
      var delay = this.backoff.duration();
      debug('will wait %dms before reconnect attempt', delay);

      this.reconnecting = true;
      var timer = setTimeout(function(){
        if (self.skipReconnect) return;

        debug('attempting reconnect');
        self.emitAll('reconnect_attempt', self.backoff.attempts);
        self.emitAll('reconnecting', self.backoff.attempts);

        // check again for the case socket closed in above events
        if (self.skipReconnect) return;

        self.open(function(err){
          if (err) {
            debug('reconnect attempt error');
            self.reconnecting = false;
            self.reconnect();
            self.emitAll('reconnect_error', err.data);
          } else {
            debug('reconnect success');
            self.onreconnect();
          }
        });
      }, delay);

      this.subs.push({
        destroy: function(){
          clearTimeout(timer);
        }
      });
    }
  };

  /**
   * Called upon successful reconnect.
   *
   * @api private
   */

  Manager.prototype.onreconnect = function(){
    var attempt = this.backoff.attempts;
    this.reconnecting = false;
    this.backoff.reset();
    this.updateSocketIds();
    this.emitAll('reconnect', attempt);
  };

},{"./on":4,"./socket":5,"./url":6,"backo2":7,"component-bind":8,"component-emitter":9,"debug":10,"engine.io-client":11,"indexof":40,"object-component":41,"socket.io-parser":44}],4:[function(_dereq_,module,exports){

  /**
   * Module exports.
   */

  module.exports = on;

  /**
   * Helper for subscriptions.
   *
   * @param {Object|EventEmitter} obj with `Emitter` mixin or `EventEmitter`
   * @param {String} event name
   * @param {Function} callback
   * @api public
   */

  function on(obj, ev, fn) {
    obj.on(ev, fn);
    return {
      destroy: function(){
        obj.removeListener(ev, fn);
      }
    };
  }

},{}],5:[function(_dereq_,module,exports){

  /**
   * Module dependencies.
   */

  var parser = _dereq_('socket.io-parser');
  var Emitter = _dereq_('component-emitter');
  var toArray = _dereq_('to-array');
  var on = _dereq_('./on');
  var bind = _dereq_('component-bind');
  var debug = _dereq_('debug')('socket.io-client:socket');
  var hasBin = _dereq_('has-binary');

  /**
   * Module exports.
   */

  module.exports = exports = Socket;

  /**
   * Internal events (blacklisted).
   * These events can't be emitted by the user.
   *
   * @api private
   */

  var events = {
    connect: 1,
    connect_error: 1,
    connect_timeout: 1,
    disconnect: 1,
    error: 1,
    reconnect: 1,
    reconnect_attempt: 1,
    reconnect_failed: 1,
    reconnect_error: 1,
    reconnecting: 1
  };

  /**
   * Shortcut to `Emitter#emit`.
   */

  var emit = Emitter.prototype.emit;

  /**
   * `Socket` constructor.
   *
   * @api public
   */

  function Socket(io, nsp){
    this.io = io;
    this.nsp = nsp;
    this.json = this; // compat
    this.ids = 0;
    this.acks = {};
    if (this.io.autoConnect) this.open();
    this.receiveBuffer = [];
    this.sendBuffer = [];
    this.connected = false;
    this.disconnected = true;
  }

  /**
   * Mix in `Emitter`.
   */

  Emitter(Socket.prototype);

  /**
   * Subscribe to open, close and packet events
   *
   * @api private
   */

  Socket.prototype.subEvents = function() {
    if (this.subs) return;

    var io = this.io;
    this.subs = [
      on(io, 'open', bind(this, 'onopen')),
      on(io, 'packet', bind(this, 'onpacket')),
      on(io, 'close', bind(this, 'onclose'))
    ];
  };

  /**
   * "Opens" the socket.
   *
   * @api public
   */

  Socket.prototype.open =
      Socket.prototype.connect = function(){
        if (this.connected) return this;

        this.subEvents();
        this.io.open(); // ensure open
        if ('open' == this.io.readyState) this.onopen();
        return this;
      };

  /**
   * Sends a `message` event.
   *
   * @return {Socket} self
   * @api public
   */

  Socket.prototype.send = function(){
    var args = toArray(arguments);
    args.unshift('message');
    this.emit.apply(this, args);
    return this;
  };

  /**
   * Override `emit`.
   * If the event is in `events`, it's emitted normally.
   *
   * @param {String} event name
   * @return {Socket} self
   * @api public
   */

  Socket.prototype.emit = function(ev){
    if (events.hasOwnProperty(ev)) {
      emit.apply(this, arguments);
      return this;
    }

    var args = toArray(arguments);
    var parserType = parser.EVENT; // default
    if (hasBin(args)) { parserType = parser.BINARY_EVENT; } // binary
    var packet = { type: parserType, data: args };

    // event ack callback
    if ('function' == typeof args[args.length - 1]) {
      debug('emitting packet with ack id %d', this.ids);
      this.acks[this.ids] = args.pop();
      packet.id = this.ids++;
    }

    if (this.connected) {
      this.packet(packet);
    } else {
      this.sendBuffer.push(packet);
    }

    return this;
  };

  /**
   * Sends a packet.
   *
   * @param {Object} packet
   * @api private
   */

  Socket.prototype.packet = function(packet){
    packet.nsp = this.nsp;
    this.io.packet(packet);
  };

  /**
   * Called upon engine `open`.
   *
   * @api private
   */

  Socket.prototype.onopen = function(){
    debug('transport is open - connecting');

    // write connect packet if necessary
    if ('/' != this.nsp) {
      this.packet({ type: parser.CONNECT });
    }
  };

  /**
   * Called upon engine `close`.
   *
   * @param {String} reason
   * @api private
   */

  Socket.prototype.onclose = function(reason){
    debug('close (%s)', reason);
    this.connected = false;
    this.disconnected = true;
    delete this.id;
    this.emit('disconnect', reason);
  };

  /**
   * Called with socket packet.
   *
   * @param {Object} packet
   * @api private
   */

  Socket.prototype.onpacket = function(packet){
    if (packet.nsp != this.nsp) return;

    switch (packet.type) {
      case parser.CONNECT:
        this.onconnect();
        break;

      case parser.EVENT:
        this.onevent(packet);
        break;

      case parser.BINARY_EVENT:
        this.onevent(packet);
        break;

      case parser.ACK:
        this.onack(packet);
        break;

      case parser.BINARY_ACK:
        this.onack(packet);
        break;

      case parser.DISCONNECT:
        this.ondisconnect();
        break;

      case parser.ERROR:
        this.emit('error', packet.data);
        break;
    }
  };

  /**
   * Called upon a server event.
   *
   * @param {Object} packet
   * @api private
   */

  Socket.prototype.onevent = function(packet){
    var args = packet.data || [];
    debug('emitting event %j', args);

    if (null != packet.id) {
      debug('attaching ack callback to event');
      args.push(this.ack(packet.id));
    }

    if (this.connected) {
      emit.apply(this, args);
    } else {
      this.receiveBuffer.push(args);
    }
  };

  /**
   * Produces an ack callback to emit with an event.
   *
   * @api private
   */

  Socket.prototype.ack = function(id){
    var self = this;
    var sent = false;
    return function(){
      // prevent double callbacks
      if (sent) return;
      sent = true;
      var args = toArray(arguments);
      debug('sending ack %j', args);

      var type = hasBin(args) ? parser.BINARY_ACK : parser.ACK;
      self.packet({
        type: type,
        id: id,
        data: args
      });
    };
  };

  /**
   * Called upon a server acknowlegement.
   *
   * @param {Object} packet
   * @api private
   */

  Socket.prototype.onack = function(packet){
    debug('calling ack %s with %j', packet.id, packet.data);
    var fn = this.acks[packet.id];
    fn.apply(this, packet.data);
    delete this.acks[packet.id];
  };

  /**
   * Called upon server connect.
   *
   * @api private
   */

  Socket.prototype.onconnect = function(){
    this.connected = true;
    this.disconnected = false;
    this.emit('connect');
    this.emitBuffered();
  };

  /**
   * Emit buffered events (received and emitted).
   *
   * @api private
   */

  Socket.prototype.emitBuffered = function(){
    var i;
    for (i = 0; i < this.receiveBuffer.length; i++) {
      emit.apply(this, this.receiveBuffer[i]);
    }
    this.receiveBuffer = [];

    for (i = 0; i < this.sendBuffer.length; i++) {
      this.packet(this.sendBuffer[i]);
    }
    this.sendBuffer = [];
  };

  /**
   * Called upon server disconnect.
   *
   * @api private
   */

  Socket.prototype.ondisconnect = function(){
    debug('server disconnect (%s)', this.nsp);
    this.destroy();
    this.onclose('io server disconnect');
  };

  /**
   * Called upon forced client/server side disconnections,
   * this method ensures the manager stops tracking us and
   * that reconnections don't get triggered for this.
   *
   * @api private.
   */

  Socket.prototype.destroy = function(){
    if (this.subs) {
      // clean subscriptions to avoid reconnections
      for (var i = 0; i < this.subs.length; i++) {
        this.subs[i].destroy();
      }
      this.subs = null;
    }

    this.io.destroy(this);
  };

  /**
   * Disconnects the socket manually.
   *
   * @return {Socket} self
   * @api public
   */

  Socket.prototype.close =
      Socket.prototype.disconnect = function(){
        if (this.connected) {
          debug('performing disconnect (%s)', this.nsp);
          this.packet({ type: parser.DISCONNECT });
        }

        // remove socket from pool
        this.destroy();

        if (this.connected) {
          // fire events
          this.onclose('io client disconnect');
        }
        return this;
      };

},{"./on":4,"component-bind":8,"component-emitter":9,"debug":10,"has-binary":36,"socket.io-parser":44,"to-array":48}],6:[function(_dereq_,module,exports){
  (function (global){

    /**
     * Module dependencies.
     */

    var parseuri = _dereq_('parseuri');
    var debug = _dereq_('debug')('socket.io-client:url');

    /**
     * Module exports.
     */

    module.exports = url;

    /**
     * URL parser.
     *
     * @param {String} url
     * @param {Object} An object meant to mimic window.location.
     *                 Defaults to window.location.
     * @api public
     */

    function url(uri, loc){
      var obj = uri;

      // default to window.location
      var loc = loc || global.location;
      if (null == uri) uri = loc.protocol + '//' + loc.host;

      // relative path support
      if ('string' == typeof uri) {
        if ('/' == uri.charAt(0)) {
          if ('/' == uri.charAt(1)) {
            uri = loc.protocol + uri;
          } else {
            uri = loc.hostname + uri;
          }
        }

        if (!/^(https?|wss?):\/\//.test(uri)) {
          debug('protocol-less url %s', uri);
          if ('undefined' != typeof loc) {
            uri = loc.protocol + '//' + uri;
          } else {
            uri = 'https://' + uri;
          }
        }

        // parse
        debug('parse %s', uri);
        obj = parseuri(uri);
      }

      // make sure we treat `localhost:80` and `localhost` equally
      if (!obj.port) {
        if (/^(http|ws)$/.test(obj.protocol)) {
          obj.port = '80';
        }
        else if (/^(http|ws)s$/.test(obj.protocol)) {
          obj.port = '443';
        }
      }

      obj.path = obj.path || '/';

      // define unique id
      obj.id = obj.protocol + '://' + obj.host + ':' + obj.port;
      // define href
      obj.href = obj.protocol + '://' + obj.host + (loc && loc.port == obj.port ? '' : (':' + obj.port));

      return obj;
    }

  }).call(this,typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
},{"debug":10,"parseuri":42}],7:[function(_dereq_,module,exports){

  /**
   * Expose `Backoff`.
   */

  module.exports = Backoff;

  /**
   * Initialize backoff timer with `opts`.
   *
   * - `min` initial timeout in milliseconds [100]
   * - `max` max timeout [10000]
   * - `jitter` [0]
   * - `factor` [2]
   *
   * @param {Object} opts
   * @api public
   */

  function Backoff(opts) {
    opts = opts || {};
    this.ms = opts.min || 100;
    this.max = opts.max || 10000;
    this.factor = opts.factor || 2;
    this.jitter = opts.jitter > 0 && opts.jitter <= 1 ? opts.jitter : 0;
    this.attempts = 0;
  }

  /**
   * Return the backoff duration.
   *
   * @return {Number}
   * @api public
   */

  Backoff.prototype.duration = function(){
    var ms = this.ms * Math.pow(this.factor, this.attempts++);
    if (this.jitter) {
      var rand =  Math.random();
      var deviation = Math.floor(rand * this.jitter * ms);
      ms = (Math.floor(rand * 10) & 1) == 0  ? ms - deviation : ms + deviation;
    }
    return Math.min(ms, this.max) | 0;
  };

  /**
   * Reset the number of attempts.
   *
   * @api public
   */

  Backoff.prototype.reset = function(){
    this.attempts = 0;
  };

  /**
   * Set the minimum duration
   *
   * @api public
   */

  Backoff.prototype.setMin = function(min){
    this.ms = min;
  };

  /**
   * Set the maximum duration
   *
   * @api public
   */

  Backoff.prototype.setMax = function(max){
    this.max = max;
  };

  /**
   * Set the jitter
   *
   * @api public
   */

  Backoff.prototype.setJitter = function(jitter){
    this.jitter = jitter;
  };


},{}],8:[function(_dereq_,module,exports){
  /**
   * Slice reference.
   */

  var slice = [].slice;

  /**
   * Bind `obj` to `fn`.
   *
   * @param {Object} obj
   * @param {Function|String} fn or string
   * @return {Function}
   * @api public
   */

  module.exports = function(obj, fn){
    if ('string' == typeof fn) fn = obj[fn];
    if ('function' != typeof fn) throw new Error('bind() requires a function');
    var args = slice.call(arguments, 2);
    return function(){
      return fn.apply(obj, args.concat(slice.call(arguments)));
    }
  };

},{}],9:[function(_dereq_,module,exports){

  /**
   * Expose `Emitter`.
   */

  module.exports = Emitter;

  /**
   * Initialize a new `Emitter`.
   *
   * @api public
   */

  function Emitter(obj) {
    if (obj) return mixin(obj);
  };

  /**
   * Mixin the emitter properties.
   *
   * @param {Object} obj
   * @return {Object}
   * @api private
   */

  function mixin(obj) {
    for (var key in Emitter.prototype) {
      obj[key] = Emitter.prototype[key];
    }
    return obj;
  }

  /**
   * Listen on the given `event` with `fn`.
   *
   * @param {String} event
   * @param {Function} fn
   * @return {Emitter}
   * @api public
   */

  Emitter.prototype.on =
      Emitter.prototype.addEventListener = function(event, fn){
        this._callbacks = this._callbacks || {};
        (this._callbacks[event] = this._callbacks[event] || [])
            .push(fn);
        return this;
      };

  /**
   * Adds an `event` listener that will be invoked a single
   * time then automatically removed.
   *
   * @param {String} event
   * @param {Function} fn
   * @return {Emitter}
   * @api public
   */

  Emitter.prototype.once = function(event, fn){
    var self = this;
    this._callbacks = this._callbacks || {};

    function on() {
      self.off(event, on);
      fn.apply(this, arguments);
    }

    on.fn = fn;
    this.on(event, on);
    return this;
  };

  /**
   * Remove the given callback for `event` or all
   * registered callbacks.
   *
   * @param {String} event
   * @param {Function} fn
   * @return {Emitter}
   * @api public
   */

  Emitter.prototype.off =
      Emitter.prototype.removeListener =
          Emitter.prototype.removeAllListeners =
              Emitter.prototype.removeEventListener = function(event, fn){
                this._callbacks = this._callbacks || {};

                // all
                if (0 == arguments.length) {
                  this._callbacks = {};
                  return this;
                }

                // specific event
                var callbacks = this._callbacks[event];
                if (!callbacks) return this;

                // remove all handlers
                if (1 == arguments.length) {
                  delete this._callbacks[event];
                  return this;
                }

                // remove specific handler
                var cb;
                for (var i = 0; i < callbacks.length; i++) {
                  cb = callbacks[i];
                  if (cb === fn || cb.fn === fn) {
                    callbacks.splice(i, 1);
                    break;
                  }
                }
                return this;
              };

  /**
   * Emit `event` with the given args.
   *
   * @param {String} event
   * @param {Mixed} ...
   * @return {Emitter}
   */

  Emitter.prototype.emit = function(event){
    this._callbacks = this._callbacks || {};
    var args = [].slice.call(arguments, 1)
        , callbacks = this._callbacks[event];

    if (callbacks) {
      callbacks = callbacks.slice(0);
      for (var i = 0, len = callbacks.length; i < len; ++i) {
        callbacks[i].apply(this, args);
      }
    }

    return this;
  };

  /**
   * Return array of callbacks for `event`.
   *
   * @param {String} event
   * @return {Array}
   * @api public
   */

  Emitter.prototype.listeners = function(event){
    this._callbacks = this._callbacks || {};
    return this._callbacks[event] || [];
  };

  /**
   * Check if this emitter has `event` handlers.
   *
   * @param {String} event
   * @return {Boolean}
   * @api public
   */

  Emitter.prototype.hasListeners = function(event){
    return !! this.listeners(event).length;
  };

},{}],10:[function(_dereq_,module,exports){

  /**
   * Expose `debug()` as the module.
   */

  module.exports = debug;

  /**
   * Create a debugger with the given `name`.
   *
   * @param {String} name
   * @return {Type}
   * @api public
   */

  function debug(name) {
    if (!debug.enabled(name)) return function(){};

    return function(fmt){
      fmt = coerce(fmt);

      var curr = new Date;
      var ms = curr - (debug[name] || curr);
      debug[name] = curr;

      fmt = name
            + ' '
            + fmt
            + ' +' + debug.humanize(ms);

      // This hackery is required for IE8
      // where `console.log` doesn't have 'apply'
      window.console
      && console.log
      && Function.prototype.apply.call(console.log, console, arguments);
    }
  }

  /**
   * The currently active debug mode names.
   */

  debug.names = [];
  debug.skips = [];

  /**
   * Enables a debug mode by name. This can include modes
   * separated by a colon and wildcards.
   *
   * @param {String} name
   * @api public
   */

  debug.enable = function(name) {
    try {
      localStorage.debug = name;
    } catch(e){}

    var split = (name || '').split(/[\s,]+/)
        , len = split.length;

    for (var i = 0; i < len; i++) {
      name = split[i].replace('*', '.*?');
      if (name[0] === '-') {
        debug.skips.push(new RegExp('^' + name.substr(1) + '$'));
      }
      else {
        debug.names.push(new RegExp('^' + name + '$'));
      }
    }
  };

  /**
   * Disable debug output.
   *
   * @api public
   */

  debug.disable = function(){
    debug.enable('');
  };

  /**
   * Humanize the given `ms`.
   *
   * @param {Number} m
   * @return {String}
   * @api private
   */

  debug.humanize = function(ms) {
    var sec = 1000
        , min = 60 * 1000
        , hour = 60 * min;

    if (ms >= hour) return (ms / hour).toFixed(1) + 'h';
    if (ms >= min) return (ms / min).toFixed(1) + 'm';
    if (ms >= sec) return (ms / sec | 0) + 's';
    return ms + 'ms';
  };

  /**
   * Returns true if the given mode name is enabled, false otherwise.
   *
   * @param {String} name
   * @return {Boolean}
   * @api public
   */

  debug.enabled = function(name) {
    for (var i = 0, len = debug.skips.length; i < len; i++) {
      if (debug.skips[i].test(name)) {
        return false;
      }
    }
    for (var i = 0, len = debug.names.length; i < len; i++) {
      if (debug.names[i].test(name)) {
        return true;
      }
    }
    return false;
  };

  /**
   * Coerce `val`.
   */

  function coerce(val) {
    if (val instanceof Error) return val.stack || val.message;
    return val;
  }

// persist

  try {
    if (window.localStorage) debug.enable(localStorage.debug);
  } catch(e){}

},{}],11:[function(_dereq_,module,exports){

  module.exports =  _dereq_('./lib/');

},{"./lib/":12}],12:[function(_dereq_,module,exports){

  module.exports = _dereq_('./socket');

  /**
   * Exports parser
   *
   * @api public
   *
   */
  module.exports.parser = _dereq_('engine.io-parser');

},{"./socket":13,"engine.io-parser":25}],13:[function(_dereq_,module,exports){
  (function (global){
    /**
     * Module dependencies.
     */

    var transports = _dereq_('./transports');
    var Emitter = _dereq_('component-emitter');
    var debug = _dereq_('debug')('engine.io-client:socket');
    var index = _dereq_('indexof');
    var parser = _dereq_('engine.io-parser');
    var parseuri = _dereq_('parseuri');
    var parsejson = _dereq_('parsejson');
    var parseqs = _dereq_('parseqs');

    /**
     * Module exports.
     */

    module.exports = Socket;

    /**
     * Noop function.
     *
     * @api private
     */

    function noop(){}

    /**
     * Socket constructor.
     *
     * @param {String|Object} uri or options
     * @param {Object} options
     * @api public
     */

    function Socket(uri, opts){
      if (!(this instanceof Socket)) return new Socket(uri, opts);

      opts = opts || {};

      if (uri && 'object' == typeof uri) {
        opts = uri;
        uri = null;
      }

      if (uri) {
        uri = parseuri(uri);
        opts.host = uri.host;
        opts.secure = uri.protocol == 'https' || uri.protocol == 'wss';
        opts.port = uri.port;
        if (uri.query) opts.query = uri.query;
      }

      this.secure = null != opts.secure ? opts.secure :
          (global.location && 'https:' == location.protocol);

      if (opts.host) {
        var pieces = opts.host.split(':');
        opts.hostname = pieces.shift();
        if (pieces.length) {
          opts.port = pieces.pop();
        } else if (!opts.port) {
          // if no port is specified manually, use the protocol default
          opts.port = this.secure ? '443' : '80';
        }
      }

      this.agent = opts.agent || false;
      this.hostname = opts.hostname ||
                      (global.location ? location.hostname : 'localhost');
      this.port = opts.port || (global.location && location.port ?
              location.port :
              (this.secure ? 443 : 80));
      this.query = opts.query || {};
      if ('string' == typeof this.query) this.query = parseqs.decode(this.query);
      this.upgrade = false !== opts.upgrade;
      this.path = (opts.path || '/engine.io').replace(/\/$/, '') + '/';
      this.forceJSONP = !!opts.forceJSONP;
      this.jsonp = false !== opts.jsonp;
      this.forceBase64 = !!opts.forceBase64;
      this.enablesXDR = !!opts.enablesXDR;
      this.timestampParam = opts.timestampParam || 't';
      this.timestampRequests = opts.timestampRequests;
      this.transports = opts.transports || ['polling', 'websocket'];
      this.readyState = '';
      this.writeBuffer = [];
      this.callbackBuffer = [];
      this.policyPort = opts.policyPort || 843;
      this.rememberUpgrade = opts.rememberUpgrade || false;
      this.binaryType = null;
      this.onlyBinaryUpgrades = opts.onlyBinaryUpgrades;

      // SSL options for Node.js client
      this.pfx = opts.pfx || null;
      this.key = opts.key || null;
      this.passphrase = opts.passphrase || null;
      this.cert = opts.cert || null;
      this.ca = opts.ca || null;
      this.ciphers = opts.ciphers || null;
      this.rejectUnauthorized = opts.rejectUnauthorized || null;

      this.open();
    }

    Socket.priorWebsocketSuccess = false;

    /**
     * Mix in `Emitter`.
     */

    Emitter(Socket.prototype);

    /**
     * Protocol version.
     *
     * @api public
     */

    Socket.protocol = parser.protocol; // this is an int

    /**
     * Expose deps for legacy compatibility
     * and standalone browser access.
     */

    Socket.Socket = Socket;
    Socket.Transport = _dereq_('./transport');
    Socket.transports = _dereq_('./transports');
    Socket.parser = _dereq_('engine.io-parser');

    /**
     * Creates transport of the given type.
     *
     * @param {String} transport name
     * @return {Transport}
     * @api private
     */

    Socket.prototype.createTransport = function (name) {
      debug('creating transport "%s"', name);
      var query = clone(this.query);

      // append engine.io protocol identifier
      query.EIO = parser.protocol;

      // transport name
      query.transport = name;

      // session id if we already have one
      if (this.id) query.sid = this.id;

      var transport = new transports[name]({
        agent: this.agent,
        hostname: this.hostname,
        port: this.port,
        secure: this.secure,
        path: this.path,
        query: query,
        forceJSONP: this.forceJSONP,
        jsonp: this.jsonp,
        forceBase64: this.forceBase64,
        enablesXDR: this.enablesXDR,
        timestampRequests: this.timestampRequests,
        timestampParam: this.timestampParam,
        policyPort: this.policyPort,
        socket: this,
        pfx: this.pfx,
        key: this.key,
        passphrase: this.passphrase,
        cert: this.cert,
        ca: this.ca,
        ciphers: this.ciphers,
        rejectUnauthorized: this.rejectUnauthorized
      });

      return transport;
    };

    function clone (obj) {
      var o = {};
      for (var i in obj) {
        if (obj.hasOwnProperty(i)) {
          o[i] = obj[i];
        }
      }
      return o;
    }

    /**
     * Initializes transport to use and starts probe.
     *
     * @api private
     */
    Socket.prototype.open = function () {
      var transport;
      if (this.rememberUpgrade && Socket.priorWebsocketSuccess && this.transports.indexOf('websocket') != -1) {
        transport = 'websocket';
      } else if (0 == this.transports.length) {
        // Emit error on next tick so it can be listened to
        var self = this;
        setTimeout(function() {
          self.emit('error', 'No transports available');
        }, 0);
        return;
      } else {
        transport = this.transports[0];
      }
      this.readyState = 'opening';

      // Retry with the next transport if the transport is disabled (jsonp: false)
      var transport;
      try {
        transport = this.createTransport(transport);
      } catch (e) {
        this.transports.shift();
        this.open();
        return;
      }

      transport.open();
      this.setTransport(transport);
    };

    /**
     * Sets the current transport. Disables the existing one (if any).
     *
     * @api private
     */

    Socket.prototype.setTransport = function(transport){
      debug('setting transport %s', transport.name);
      var self = this;

      if (this.transport) {
        debug('clearing existing transport %s', this.transport.name);
        this.transport.removeAllListeners();
      }

      // set up transport
      this.transport = transport;

      // set up transport listeners
      transport
          .on('drain', function(){
            self.onDrain();
          })
          .on('packet', function(packet){
            self.onPacket(packet);
          })
          .on('error', function(e){
            self.onError(e);
          })
          .on('close', function(){
            self.onClose('transport close');
          });
    };

    /**
     * Probes a transport.
     *
     * @param {String} transport name
     * @api private
     */

    Socket.prototype.probe = function (name) {
      debug('probing transport "%s"', name);
      var transport = this.createTransport(name, { probe: 1 })
          , failed = false
          , self = this;

      Socket.priorWebsocketSuccess = false;

      function onTransportOpen(){
        if (self.onlyBinaryUpgrades) {
          var upgradeLosesBinary = !this.supportsBinary && self.transport.supportsBinary;
          failed = failed || upgradeLosesBinary;
        }
        if (failed) return;

        debug('probe transport "%s" opened', name);
        transport.send([{ type: 'ping', data: 'probe' }]);
        transport.once('packet', function (msg) {
          if (failed) return;
          if ('pong' == msg.type && 'probe' == msg.data) {
            debug('probe transport "%s" pong', name);
            self.upgrading = true;
            self.emit('upgrading', transport);
            if (!transport) return;
            Socket.priorWebsocketSuccess = 'websocket' == transport.name;

            debug('pausing current transport "%s"', self.transport.name);
            self.transport.pause(function () {
              if (failed) return;
              if ('closed' == self.readyState) return;
              debug('changing transport and sending upgrade packet');

              cleanup();

              self.setTransport(transport);
              transport.send([{ type: 'upgrade' }]);
              self.emit('upgrade', transport);
              transport = null;
              self.upgrading = false;
              self.flush();
            });
          } else {
            debug('probe transport "%s" failed', name);
            var err = new Error('probe error');
            err.transport = transport.name;
            self.emit('upgradeError', err);
          }
        });
      }

      function freezeTransport() {
        if (failed) return;

        // Any callback called by transport should be ignored since now
        failed = true;

        cleanup();

        transport.close();
        transport = null;
      }

      //Handle any error that happens while probing
      function onerror(err) {
        var error = new Error('probe error: ' + err);
        error.transport = transport.name;

        freezeTransport();

        debug('probe transport "%s" failed because of error: %s', name, err);

        self.emit('upgradeError', error);
      }

      function onTransportClose(){
        onerror("transport closed");
      }

      //When the socket is closed while we're probing
      function onclose(){
        onerror("socket closed");
      }

      //When the socket is upgraded while we're probing
      function onupgrade(to){
        if (transport && to.name != transport.name) {
          debug('"%s" works - aborting "%s"', to.name, transport.name);
          freezeTransport();
        }
      }

      //Remove all listeners on the transport and on self
      function cleanup(){
        transport.removeListener('open', onTransportOpen);
        transport.removeListener('error', onerror);
        transport.removeListener('close', onTransportClose);
        self.removeListener('close', onclose);
        self.removeListener('upgrading', onupgrade);
      }

      transport.once('open', onTransportOpen);
      transport.once('error', onerror);
      transport.once('close', onTransportClose);

      this.once('close', onclose);
      this.once('upgrading', onupgrade);

      transport.open();

    };

    /**
     * Called when connection is deemed open.
     *
     * @api public
     */

    Socket.prototype.onOpen = function () {
      debug('socket open');
      this.readyState = 'open';
      Socket.priorWebsocketSuccess = 'websocket' == this.transport.name;
      this.emit('open');
      this.flush();

      // we check for `readyState` in case an `open`
      // listener already closed the socket
      if ('open' == this.readyState && this.upgrade && this.transport.pause) {
        debug('starting upgrade probes');
        for (var i = 0, l = this.upgrades.length; i < l; i++) {
          this.probe(this.upgrades[i]);
        }
      }
    };

    /**
     * Handles a packet.
     *
     * @api private
     */

    Socket.prototype.onPacket = function (packet) {
      if ('opening' == this.readyState || 'open' == this.readyState) {
        debug('socket receive: type "%s", data "%s"', packet.type, packet.data);

        this.emit('packet', packet);

        // Socket is live - any packet counts
        this.emit('heartbeat');

        switch (packet.type) {
          case 'open':
            this.onHandshake(parsejson(packet.data));
            break;

          case 'pong':
            this.setPing();
            break;

          case 'error':
            var err = new Error('server error');
            err.code = packet.data;
            this.emit('error', err);
            break;

          case 'message':
            this.emit('data', packet.data);
            this.emit('message', packet.data);
            break;
        }
      } else {
        debug('packet received with socket readyState "%s"', this.readyState);
      }
    };

    /**
     * Called upon handshake completion.
     *
     * @param {Object} handshake obj
     * @api private
     */

    Socket.prototype.onHandshake = function (data) {
      this.emit('handshake', data);
      this.id = data.sid;
      this.transport.query.sid = data.sid;
      this.upgrades = this.filterUpgrades(data.upgrades);
      this.pingInterval = data.pingInterval;
      this.pingTimeout = data.pingTimeout;
      this.onOpen();
      // In case open handler closes socket
      if  ('closed' == this.readyState) return;
      this.setPing();

      // Prolong liveness of socket on heartbeat
      this.removeListener('heartbeat', this.onHeartbeat);
      this.on('heartbeat', this.onHeartbeat);
    };

    /**
     * Resets ping timeout.
     *
     * @api private
     */

    Socket.prototype.onHeartbeat = function (timeout) {
      clearTimeout(this.pingTimeoutTimer);
      var self = this;
      self.pingTimeoutTimer = setTimeout(function () {
        if ('closed' == self.readyState) return;
        self.onClose('ping timeout');
      }, timeout || (self.pingInterval + self.pingTimeout));
    };

    /**
     * Pings server every `this.pingInterval` and expects response
     * within `this.pingTimeout` or closes connection.
     *
     * @api private
     */

    Socket.prototype.setPing = function () {
      var self = this;
      clearTimeout(self.pingIntervalTimer);
      self.pingIntervalTimer = setTimeout(function () {
        debug('writing ping packet - expecting pong within %sms', self.pingTimeout);
        self.ping();
        self.onHeartbeat(self.pingTimeout);
      }, self.pingInterval);
    };

    /**
     * Sends a ping packet.
     *
     * @api public
     */

    Socket.prototype.ping = function () {
      this.sendPacket('ping');
    };

    /**
     * Called on `drain` event
     *
     * @api private
     */

    Socket.prototype.onDrain = function() {
      for (var i = 0; i < this.prevBufferLen; i++) {
        if (this.callbackBuffer[i]) {
          this.callbackBuffer[i]();
        }
      }

      this.writeBuffer.splice(0, this.prevBufferLen);
      this.callbackBuffer.splice(0, this.prevBufferLen);

      // setting prevBufferLen = 0 is very important
      // for example, when upgrading, upgrade packet is sent over,
      // and a nonzero prevBufferLen could cause problems on `drain`
      this.prevBufferLen = 0;

      if (this.writeBuffer.length == 0) {
        this.emit('drain');
      } else {
        this.flush();
      }
    };

    /**
     * Flush write buffers.
     *
     * @api private
     */

    Socket.prototype.flush = function () {
      if ('closed' != this.readyState && this.transport.writable &&
          !this.upgrading && this.writeBuffer.length) {
        debug('flushing %d packets in socket', this.writeBuffer.length);
        this.transport.send(this.writeBuffer);
        // keep track of current length of writeBuffer
        // splice writeBuffer and callbackBuffer on `drain`
        this.prevBufferLen = this.writeBuffer.length;
        this.emit('flush');
      }
    };

    /**
     * Sends a message.
     *
     * @param {String} message.
     * @param {Function} callback function.
     * @return {Socket} for chaining.
     * @api public
     */

    Socket.prototype.write =
        Socket.prototype.send = function (msg, fn) {
          this.sendPacket('message', msg, fn);
          return this;
        };

    /**
     * Sends a packet.
     *
     * @param {String} packet type.
     * @param {String} data.
     * @param {Function} callback function.
     * @api private
     */

    Socket.prototype.sendPacket = function (type, data, fn) {
      if ('closing' == this.readyState || 'closed' == this.readyState) {
        return;
      }

      var packet = { type: type, data: data };
      this.emit('packetCreate', packet);
      this.writeBuffer.push(packet);
      this.callbackBuffer.push(fn);
      this.flush();
    };

    /**
     * Closes the connection.
     *
     * @api private
     */

    Socket.prototype.close = function () {
      if ('opening' == this.readyState || 'open' == this.readyState) {
        this.readyState = 'closing';

        var self = this;

        function close() {
          self.onClose('forced close');
          debug('socket closing - telling transport to close');
          self.transport.close();
        }

        function cleanupAndClose() {
          self.removeListener('upgrade', cleanupAndClose);
          self.removeListener('upgradeError', cleanupAndClose);
          close();
        }

        function waitForUpgrade() {
          // wait for upgrade to finish since we can't send packets while pausing a transport
          self.once('upgrade', cleanupAndClose);
          self.once('upgradeError', cleanupAndClose);
        }

        if (this.writeBuffer.length) {
          this.once('drain', function() {
            if (this.upgrading) {
              waitForUpgrade();
            } else {
              close();
            }
          });
        } else if (this.upgrading) {
          waitForUpgrade();
        } else {
          close();
        }
      }

      return this;
    };

    /**
     * Called upon transport error
     *
     * @api private
     */

    Socket.prototype.onError = function (err) {
      debug('socket error %j', err);
      Socket.priorWebsocketSuccess = false;
      this.emit('error', err);
      this.onClose('transport error', err);
    };

    /**
     * Called upon transport close.
     *
     * @api private
     */

    Socket.prototype.onClose = function (reason, desc) {
      if ('opening' == this.readyState || 'open' == this.readyState || 'closing' == this.readyState) {
        debug('socket close with reason: "%s"', reason);
        var self = this;

        // clear timers
        clearTimeout(this.pingIntervalTimer);
        clearTimeout(this.pingTimeoutTimer);

        // clean buffers in next tick, so developers can still
        // grab the buffers on `close` event
        setTimeout(function() {
          self.writeBuffer = [];
          self.callbackBuffer = [];
          self.prevBufferLen = 0;
        }, 0);

        // stop event from firing again for transport
        this.transport.removeAllListeners('close');

        // ensure transport won't stay open
        this.transport.close();

        // ignore further transport communication
        this.transport.removeAllListeners();

        // set ready state
        this.readyState = 'closed';

        // clear session id
        this.id = null;

        // emit close event
        this.emit('close', reason, desc);
      }
    };

    /**
     * Filters upgrades, returning only those matching client transports.
     *
     * @param {Array} server upgrades
     * @api private
     *
     */

    Socket.prototype.filterUpgrades = function (upgrades) {
      var filteredUpgrades = [];
      for (var i = 0, j = upgrades.length; i<j; i++) {
        if (~index(this.transports, upgrades[i])) filteredUpgrades.push(upgrades[i]);
      }
      return filteredUpgrades;
    };

  }).call(this,typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
},{"./transport":14,"./transports":15,"component-emitter":9,"debug":22,"engine.io-parser":25,"indexof":40,"parsejson":32,"parseqs":33,"parseuri":34}],14:[function(_dereq_,module,exports){
  /**
   * Module dependencies.
   */

  var parser = _dereq_('engine.io-parser');
  var Emitter = _dereq_('component-emitter');

  /**
   * Module exports.
   */

  module.exports = Transport;

  /**
   * Transport abstract constructor.
   *
   * @param {Object} options.
   * @api private
   */

  function Transport (opts) {
    this.path = opts.path;
    this.hostname = opts.hostname;
    this.port = opts.port;
    this.secure = opts.secure;
    this.query = opts.query;
    this.timestampParam = opts.timestampParam;
    this.timestampRequests = opts.timestampRequests;
    this.readyState = '';
    this.agent = opts.agent || false;
    this.socket = opts.socket;
    this.enablesXDR = opts.enablesXDR;

    // SSL options for Node.js client
    this.pfx = opts.pfx;
    this.key = opts.key;
    this.passphrase = opts.passphrase;
    this.cert = opts.cert;
    this.ca = opts.ca;
    this.ciphers = opts.ciphers;
    this.rejectUnauthorized = opts.rejectUnauthorized;
  }

  /**
   * Mix in `Emitter`.
   */

  Emitter(Transport.prototype);

  /**
   * A counter used to prevent collisions in the timestamps used
   * for cache busting.
   */

  Transport.timestamps = 0;

  /**
   * Emits an error.
   *
   * @param {String} str
   * @return {Transport} for chaining
   * @api public
   */

  Transport.prototype.onError = function (msg, desc) {
    var err = new Error(msg);
    err.type = 'TransportError';
    err.description = desc;
    this.emit('error', err);
    return this;
  };

  /**
   * Opens the transport.
   *
   * @api public
   */

  Transport.prototype.open = function () {
    if ('closed' == this.readyState || '' == this.readyState) {
      this.readyState = 'opening';
      this.doOpen();
    }

    return this;
  };

  /**
   * Closes the transport.
   *
   * @api private
   */

  Transport.prototype.close = function () {
    if ('opening' == this.readyState || 'open' == this.readyState) {
      this.doClose();
      this.onClose();
    }

    return this;
  };

  /**
   * Sends multiple packets.
   *
   * @param {Array} packets
   * @api private
   */

  Transport.prototype.send = function(packets){
    if ('open' == this.readyState) {
      this.write(packets);
    } else {
      throw new Error('Transport not open');
    }
  };

  /**
   * Called upon open
   *
   * @api private
   */

  Transport.prototype.onOpen = function () {
    this.readyState = 'open';
    this.writable = true;
    this.emit('open');
  };

  /**
   * Called with data.
   *
   * @param {String} data
   * @api private
   */

  Transport.prototype.onData = function(data){
    var packet = parser.decodePacket(data, this.socket.binaryType);
    this.onPacket(packet);
  };

  /**
   * Called with a decoded packet.
   */

  Transport.prototype.onPacket = function (packet) {
    this.emit('packet', packet);
  };

  /**
   * Called upon close.
   *
   * @api private
   */

  Transport.prototype.onClose = function () {
    this.readyState = 'closed';
    this.emit('close');
  };

},{"component-emitter":9,"engine.io-parser":25}],15:[function(_dereq_,module,exports){
  (function (global){
    /**
     * Module dependencies
     */

    var XMLHttpRequest = _dereq_('xmlhttprequest');
    var XHR = _dereq_('./polling-xhr');
    var JSONP = _dereq_('./polling-jsonp');
    var websocket = _dereq_('./websocket');

    /**
     * Export transports.
     */

    exports.polling = polling;
    exports.websocket = websocket;

    /**
     * Polling transport polymorphic constructor.
     * Decides on xhr vs jsonp based on feature detection.
     *
     * @api private
     */

    function polling(opts){
      var xhr;
      var xd = false;
      var xs = false;
      var jsonp = false !== opts.jsonp;

      if (global.location) {
        var isSSL = 'https:' == location.protocol;
        var port = location.port;

        // some user agents have empty `location.port`
        if (!port) {
          port = isSSL ? 443 : 80;
        }

        xd = opts.hostname != location.hostname || port != opts.port;
        xs = opts.secure != isSSL;
      }

      opts.xdomain = xd;
      opts.xscheme = xs;
      xhr = new XMLHttpRequest(opts);

      if ('open' in xhr && !opts.forceJSONP) {
        return new XHR(opts);
      } else {
        if (!jsonp) throw new Error('JSONP disabled');
        return new JSONP(opts);
      }
    }

  }).call(this,typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
},{"./polling-jsonp":16,"./polling-xhr":17,"./websocket":19,"xmlhttprequest":20}],16:[function(_dereq_,module,exports){
  (function (global){

    /**
     * Module requirements.
     */

    var Polling = _dereq_('./polling');
    var inherit = _dereq_('component-inherit');

    /**
     * Module exports.
     */

    module.exports = JSONPPolling;

    /**
     * Cached regular expressions.
     */

    var rNewline = /\n/g;
    var rEscapedNewline = /\\n/g;

    /**
     * Global JSONP callbacks.
     */

    var callbacks;

    /**
     * Callbacks count.
     */

    var index = 0;

    /**
     * Noop.
     */

    function empty () { }

    /**
     * JSONP Polling constructor.
     *
     * @param {Object} opts.
     * @api public
     */

    function JSONPPolling (opts) {
      Polling.call(this, opts);

      this.query = this.query || {};

      // define global callbacks array if not present
      // we do this here (lazily) to avoid unneeded global pollution
      if (!callbacks) {
        // we need to consider multiple engines in the same page
        if (!global.___eio) global.___eio = [];
        callbacks = global.___eio;
      }

      // callback identifier
      this.index = callbacks.length;

      // add callback to jsonp global
      var self = this;
      callbacks.push(function (msg) {
        self.onData(msg);
      });

      // append to query string
      this.query.j = this.index;

      // prevent spurious errors from being emitted when the window is unloaded
      if (global.document && global.addEventListener) {
        global.addEventListener('beforeunload', function () {
          if (self.script) self.script.onerror = empty;
        }, false);
      }
    }

    /**
     * Inherits from Polling.
     */

    inherit(JSONPPolling, Polling);

    /*
     * JSONP only supports binary as base64 encoded strings
     */

    JSONPPolling.prototype.supportsBinary = false;

    /**
     * Closes the socket.
     *
     * @api private
     */

    JSONPPolling.prototype.doClose = function () {
      if (this.script) {
        this.script.parentNode.removeChild(this.script);
        this.script = null;
      }

      if (this.form) {
        this.form.parentNode.removeChild(this.form);
        this.form = null;
        this.iframe = null;
      }

      Polling.prototype.doClose.call(this);
    };

    /**
     * Starts a poll cycle.
     *
     * @api private
     */

    JSONPPolling.prototype.doPoll = function () {
      var self = this;
      var script = document.createElement('script');

      if (this.script) {
        this.script.parentNode.removeChild(this.script);
        this.script = null;
      }

      script.async = true;
      script.src = this.uri();
      script.onerror = function(e){
        self.onError('jsonp poll error',e);
      };

      var insertAt = document.getElementsByTagName('script')[0];
      insertAt.parentNode.insertBefore(script, insertAt);
      this.script = script;

      var isUAgecko = 'undefined' != typeof navigator && /gecko/i.test(navigator.userAgent);

      if (isUAgecko) {
        setTimeout(function () {
          var iframe = document.createElement('iframe');
          document.body.appendChild(iframe);
          document.body.removeChild(iframe);
        }, 100);
      }
    };

    /**
     * Writes with a hidden iframe.
     *
     * @param {String} data to send
     * @param {Function} called upon flush.
     * @api private
     */

    JSONPPolling.prototype.doWrite = function (data, fn) {
      var self = this;

      if (!this.form) {
        var form = document.createElement('form');
        var area = document.createElement('textarea');
        var id = this.iframeId = 'eio_iframe_' + this.index;
        var iframe;

        form.className = 'socketio';
        form.style.position = 'absolute';
        form.style.top = '-1000px';
        form.style.left = '-1000px';
        form.target = id;
        form.method = 'POST';
        form.setAttribute('accept-charset', 'utf-8');
        area.name = 'd';
        form.appendChild(area);
        document.body.appendChild(form);

        this.form = form;
        this.area = area;
      }

      this.form.action = this.uri();

      function complete () {
        initIframe();
        fn();
      }

      function initIframe () {
        if (self.iframe) {
          try {
            self.form.removeChild(self.iframe);
          } catch (e) {
            self.onError('jsonp polling iframe removal error', e);
          }
        }

        try {
          // ie6 dynamic iframes with target="" support (thanks Chris Lambacher)
          var html = '<iframe src="javascript:0" name="'+ self.iframeId +'">';
          iframe = document.createElement(html);
        } catch (e) {
          iframe = document.createElement('iframe');
          iframe.name = self.iframeId;
          iframe.src = 'javascript:0';
        }

        iframe.id = self.iframeId;

        self.form.appendChild(iframe);
        self.iframe = iframe;
      }

      initIframe();

      // escape \n to prevent it from being converted into \r\n by some UAs
      // double escaping is required for escaped new lines because unescaping of new lines can be done safely on server-side
      data = data.replace(rEscapedNewline, '\\\n');
      this.area.value = data.replace(rNewline, '\\n');

      try {
        this.form.submit();
      } catch(e) {}

      if (this.iframe.attachEvent) {
        this.iframe.onreadystatechange = function(){
          if (self.iframe.readyState == 'complete') {
            complete();
          }
        };
      } else {
        this.iframe.onload = complete;
      }
    };

  }).call(this,typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
},{"./polling":18,"component-inherit":21}],17:[function(_dereq_,module,exports){
  (function (global){
    /**
     * Module requirements.
     */

    var XMLHttpRequest = _dereq_('xmlhttprequest');
    var Polling = _dereq_('./polling');
    var Emitter = _dereq_('component-emitter');
    var inherit = _dereq_('component-inherit');
    var debug = _dereq_('debug')('engine.io-client:polling-xhr');

    /**
     * Module exports.
     */

    module.exports = XHR;
    module.exports.Request = Request;

    /**
     * Empty function
     */

    function empty(){}

    /**
     * XHR Polling constructor.
     *
     * @param {Object} opts
     * @api public
     */

    function XHR(opts){
      Polling.call(this, opts);

      if (global.location) {
        var isSSL = 'https:' == location.protocol;
        var port = location.port;

        // some user agents have empty `location.port`
        if (!port) {
          port = isSSL ? 443 : 80;
        }

        this.xd = opts.hostname != global.location.hostname ||
                  port != opts.port;
        this.xs = opts.secure != isSSL;
      }
    }

    /**
     * Inherits from Polling.
     */

    inherit(XHR, Polling);

    /**
     * XHR supports binary
     */

    XHR.prototype.supportsBinary = true;

    /**
     * Creates a request.
     *
     * @param {String} method
     * @api private
     */

    XHR.prototype.request = function(opts){
      opts = opts || {};
      opts.uri = this.uri();
      opts.xd = this.xd;
      opts.xs = this.xs;
      opts.agent = this.agent || false;
      opts.supportsBinary = this.supportsBinary;
      opts.enablesXDR = this.enablesXDR;

      // SSL options for Node.js client
      opts.pfx = this.pfx;
      opts.key = this.key;
      opts.passphrase = this.passphrase;
      opts.cert = this.cert;
      opts.ca = this.ca;
      opts.ciphers = this.ciphers;
      opts.rejectUnauthorized = this.rejectUnauthorized;

      return new Request(opts);
    };

    /**
     * Sends data.
     *
     * @param {String} data to send.
     * @param {Function} called upon flush.
     * @api private
     */

    XHR.prototype.doWrite = function(data, fn){
      var isBinary = typeof data !== 'string' && data !== undefined;
      var req = this.request({ method: 'POST', data: data, isBinary: isBinary });
      var self = this;
      req.on('success', fn);
      req.on('error', function(err){
        self.onError('xhr post error', err);
      });
      this.sendXhr = req;
    };

    /**
     * Starts a poll cycle.
     *
     * @api private
     */

    XHR.prototype.doPoll = function(){
      debug('xhr poll');
      var req = this.request();
      var self = this;
      req.on('data', function(data){
        self.onData(data);
      });
      req.on('error', function(err){
        self.onError('xhr poll error', err);
      });
      this.pollXhr = req;
    };

    /**
     * Request constructor
     *
     * @param {Object} options
     * @api public
     */

    function Request(opts){
      this.method = opts.method || 'GET';
      this.uri = opts.uri;
      this.xd = !!opts.xd;
      this.xs = !!opts.xs;
      this.async = false !== opts.async;
      this.data = undefined != opts.data ? opts.data : null;
      this.agent = opts.agent;
      this.isBinary = opts.isBinary;
      this.supportsBinary = opts.supportsBinary;
      this.enablesXDR = opts.enablesXDR;

      // SSL options for Node.js client
      this.pfx = opts.pfx;
      this.key = opts.key;
      this.passphrase = opts.passphrase;
      this.cert = opts.cert;
      this.ca = opts.ca;
      this.ciphers = opts.ciphers;
      this.rejectUnauthorized = opts.rejectUnauthorized;

      this.create();
    }

    /**
     * Mix in `Emitter`.
     */

    Emitter(Request.prototype);

    /**
     * Creates the XHR object and sends the request.
     *
     * @api private
     */

    Request.prototype.create = function(){
      var opts = { agent: this.agent, xdomain: this.xd, xscheme: this.xs, enablesXDR: this.enablesXDR };

      // SSL options for Node.js client
      opts.pfx = this.pfx;
      opts.key = this.key;
      opts.passphrase = this.passphrase;
      opts.cert = this.cert;
      opts.ca = this.ca;
      opts.ciphers = this.ciphers;
      opts.rejectUnauthorized = this.rejectUnauthorized;

      var xhr = this.xhr = new XMLHttpRequest(opts);
      var self = this;

      try {
        debug('xhr open %s: %s', this.method, this.uri);
        xhr.open(this.method, this.uri, this.async);
        if (this.supportsBinary) {
          // This has to be done after open because Firefox is stupid
          // http://stackoverflow.com/questions/13216903/get-binary-data-with-xmlhttprequest-in-a-firefox-extension
          xhr.responseType = 'arraybuffer';
        }

        if ('POST' == this.method) {
          try {
            if (this.isBinary) {
              xhr.setRequestHeader('Content-type', 'application/octet-stream');
            } else {
              xhr.setRequestHeader('Content-type', 'text/plain;charset=UTF-8');
            }
          } catch (e) {}
        }

        // ie6 check
        if ('withCredentials' in xhr) {
          xhr.withCredentials = true;
        }

        if (this.hasXDR()) {
          xhr.onload = function(){
            self.onLoad();
          };
          xhr.onerror = function(){
            self.onError(xhr.responseText);
          };
        } else {
          xhr.onreadystatechange = function(){
            if (4 != xhr.readyState) return;
            if (200 == xhr.status || 1223 == xhr.status) {
              self.onLoad();
            } else {
              // make sure the `error` event handler that's user-set
              // does not throw in the same tick and gets caught here
              setTimeout(function(){
                self.onError(xhr.status);
              }, 0);
            }
          };
        }

        debug('xhr data %s', this.data);
        xhr.send(this.data);
      } catch (e) {
        // Need to defer since .create() is called directly fhrom the constructor
        // and thus the 'error' event can only be only bound *after* this exception
        // occurs.  Therefore, also, we cannot throw here at all.
        setTimeout(function() {
          self.onError(e);
        }, 0);
        return;
      }

      if (global.document) {
        this.index = Request.requestsCount++;
        Request.requests[this.index] = this;
      }
    };

    /**
     * Called upon successful response.
     *
     * @api private
     */

    Request.prototype.onSuccess = function(){
      this.emit('success');
      this.cleanup();
    };

    /**
     * Called if we have data.
     *
     * @api private
     */

    Request.prototype.onData = function(data){
      this.emit('data', data);
      this.onSuccess();
    };

    /**
     * Called upon error.
     *
     * @api private
     */

    Request.prototype.onError = function(err){
      this.emit('error', err);
      this.cleanup(true);
    };

    /**
     * Cleans up house.
     *
     * @api private
     */

    Request.prototype.cleanup = function(fromError){
      if ('undefined' == typeof this.xhr || null === this.xhr) {
        return;
      }
      // xmlhttprequest
      if (this.hasXDR()) {
        this.xhr.onload = this.xhr.onerror = empty;
      } else {
        this.xhr.onreadystatechange = empty;
      }

      if (fromError) {
        try {
          this.xhr.abort();
        } catch(e) {}
      }

      if (global.document) {
        delete Request.requests[this.index];
      }

      this.xhr = null;
    };

    /**
     * Called upon load.
     *
     * @api private
     */

    Request.prototype.onLoad = function(){
      var data;
      try {
        var contentType;
        try {
          contentType = this.xhr.getResponseHeader('Content-Type').split(';')[0];
        } catch (e) {}
        if (contentType === 'application/octet-stream') {
          data = this.xhr.response;
        } else {
          if (!this.supportsBinary) {
            data = this.xhr.responseText;
          } else {
            data = 'ok';
          }
        }
      } catch (e) {
        this.onError(e);
      }
      if (null != data) {
        this.onData(data);
      }
    };

    /**
     * Check if it has XDomainRequest.
     *
     * @api private
     */

    Request.prototype.hasXDR = function(){
      return 'undefined' !== typeof global.XDomainRequest && !this.xs && this.enablesXDR;
    };

    /**
     * Aborts the request.
     *
     * @api public
     */

    Request.prototype.abort = function(){
      this.cleanup();
    };

    /**
     * Aborts pending requests when unloading the window. This is needed to prevent
     * memory leaks (e.g. when using IE) and to ensure that no spurious error is
     * emitted.
     */

    if (global.document) {
      Request.requestsCount = 0;
      Request.requests = {};
      if (global.attachEvent) {
        global.attachEvent('onunload', unloadHandler);
      } else if (global.addEventListener) {
        global.addEventListener('beforeunload', unloadHandler, false);
      }
    }

    function unloadHandler() {
      for (var i in Request.requests) {
        if (Request.requests.hasOwnProperty(i)) {
          Request.requests[i].abort();
        }
      }
    }

  }).call(this,typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
},{"./polling":18,"component-emitter":9,"component-inherit":21,"debug":22,"xmlhttprequest":20}],18:[function(_dereq_,module,exports){
  /**
   * Module dependencies.
   */

  var Transport = _dereq_('../transport');
  var parseqs = _dereq_('parseqs');
  var parser = _dereq_('engine.io-parser');
  var inherit = _dereq_('component-inherit');
  var debug = _dereq_('debug')('engine.io-client:polling');

  /**
   * Module exports.
   */

  module.exports = Polling;

  /**
   * Is XHR2 supported?
   */

  var hasXHR2 = (function() {
    var XMLHttpRequest = _dereq_('xmlhttprequest');
    var xhr = new XMLHttpRequest({ xdomain: false });
    return null != xhr.responseType;
  })();

  /**
   * Polling interface.
   *
   * @param {Object} opts
   * @api private
   */

  function Polling(opts){
    var forceBase64 = (opts && opts.forceBase64);
    if (!hasXHR2 || forceBase64) {
      this.supportsBinary = false;
    }
    Transport.call(this, opts);
  }

  /**
   * Inherits from Transport.
   */

  inherit(Polling, Transport);

  /**
   * Transport name.
   */

  Polling.prototype.name = 'polling';

  /**
   * Opens the socket (triggers polling). We write a PING message to determine
   * when the transport is open.
   *
   * @api private
   */

  Polling.prototype.doOpen = function(){
    this.poll();
  };

  /**
   * Pauses polling.
   *
   * @param {Function} callback upon buffers are flushed and transport is paused
   * @api private
   */

  Polling.prototype.pause = function(onPause){
    var pending = 0;
    var self = this;

    this.readyState = 'pausing';

    function pause(){
      debug('paused');
      self.readyState = 'paused';
      onPause();
    }

    if (this.polling || !this.writable) {
      var total = 0;

      if (this.polling) {
        debug('we are currently polling - waiting to pause');
        total++;
        this.once('pollComplete', function(){
          debug('pre-pause polling complete');
          --total || pause();
        });
      }

      if (!this.writable) {
        debug('we are currently writing - waiting to pause');
        total++;
        this.once('drain', function(){
          debug('pre-pause writing complete');
          --total || pause();
        });
      }
    } else {
      pause();
    }
  };

  /**
   * Starts polling cycle.
   *
   * @api public
   */

  Polling.prototype.poll = function(){
    debug('polling');
    this.polling = true;
    this.doPoll();
    this.emit('poll');
  };

  /**
   * Overloads onData to detect payloads.
   *
   * @api private
   */

  Polling.prototype.onData = function(data){
    var self = this;
    debug('polling got data %s', data);
    var callback = function(packet, index, total) {
      // if its the first message we consider the transport open
      if ('opening' == self.readyState) {
        self.onOpen();
      }

      // if its a close packet, we close the ongoing requests
      if ('close' == packet.type) {
        self.onClose();
        return false;
      }

      // otherwise bypass onData and handle the message
      self.onPacket(packet);
    };

    // decode payload
    parser.decodePayload(data, this.socket.binaryType, callback);

    // if an event did not trigger closing
    if ('closed' != this.readyState) {
      // if we got data we're not polling
      this.polling = false;
      this.emit('pollComplete');

      if ('open' == this.readyState) {
        this.poll();
      } else {
        debug('ignoring poll - transport state "%s"', this.readyState);
      }
    }
  };

  /**
   * For polling, send a close packet.
   *
   * @api private
   */

  Polling.prototype.doClose = function(){
    var self = this;

    function close(){
      debug('writing close packet');
      self.write([{ type: 'close' }]);
    }

    if ('open' == this.readyState) {
      debug('transport open - closing');
      close();
    } else {
      // in case we're trying to close while
      // handshaking is in progress (GH-164)
      debug('transport not open - deferring close');
      this.once('open', close);
    }
  };

  /**
   * Writes a packets payload.
   *
   * @param {Array} data packets
   * @param {Function} drain callback
   * @api private
   */

  Polling.prototype.write = function(packets){
    var self = this;
    this.writable = false;
    var callbackfn = function() {
      self.writable = true;
      self.emit('drain');
    };

    var self = this;
    parser.encodePayload(packets, this.supportsBinary, function(data) {
      self.doWrite(data, callbackfn);
    });
  };

  /**
   * Generates uri for connection.
   *
   * @api private
   */

  Polling.prototype.uri = function(){
    var query = this.query || {};
    var schema = this.secure ? 'https' : 'http';
    var port = '';

    // cache busting is forced
    if (false !== this.timestampRequests) {
      query[this.timestampParam] = +new Date + '-' + Transport.timestamps++;
    }

    if (!this.supportsBinary && !query.sid) {
      query.b64 = 1;
    }

    query = parseqs.encode(query);

    // avoid port if default for schema
    if (this.port && (('https' == schema && this.port != 443) ||
                      ('http' == schema && this.port != 80))) {
      port = ':' + this.port;
    }

    // prepend ? to query
    if (query.length) {
      query = '?' + query;
    }

    return schema + '://' + this.hostname + port + this.path + query;
  };

},{"../transport":14,"component-inherit":21,"debug":22,"engine.io-parser":25,"parseqs":33,"xmlhttprequest":20}],19:[function(_dereq_,module,exports){
  /**
   * Module dependencies.
   */

  var Transport = _dereq_('../transport');
  var parser = _dereq_('engine.io-parser');
  var parseqs = _dereq_('parseqs');
  var inherit = _dereq_('component-inherit');
  var debug = _dereq_('debug')('engine.io-client:websocket');

  /**
   * `ws` exposes a WebSocket-compatible interface in
   * Node, or the `WebSocket` or `MozWebSocket` globals
   * in the browser.
   */

  var WebSocket = _dereq_('ws');

  /**
   * Module exports.
   */

  module.exports = WS;

  /**
   * WebSocket transport constructor.
   *
   * @api {Object} connection options
   * @api public
   */

  function WS(opts){
    var forceBase64 = (opts && opts.forceBase64);
    if (forceBase64) {
      this.supportsBinary = false;
    }
    Transport.call(this, opts);
  }

  /**
   * Inherits from Transport.
   */

  inherit(WS, Transport);

  /**
   * Transport name.
   *
   * @api public
   */

  WS.prototype.name = 'websocket';

  /*
   * WebSockets support binary
   */

  WS.prototype.supportsBinary = true;

  /**
   * Opens socket.
   *
   * @api private
   */

  WS.prototype.doOpen = function(){
    if (!this.check()) {
      // let probe timeout
      return;
    }

    var self = this;
    var uri = this.uri();
    var protocols = void(0);
    var opts = { agent: this.agent };

    // SSL options for Node.js client
    opts.pfx = this.pfx;
    opts.key = this.key;
    opts.passphrase = this.passphrase;
    opts.cert = this.cert;
    opts.ca = this.ca;
    opts.ciphers = this.ciphers;
    opts.rejectUnauthorized = this.rejectUnauthorized;

    this.ws = new WebSocket(uri, protocols, opts);

    if (this.ws.binaryType === undefined) {
      this.supportsBinary = false;
    }

    this.ws.binaryType = 'arraybuffer';
    this.addEventListeners();
  };

  /**
   * Adds event listeners to the socket
   *
   * @api private
   */

  WS.prototype.addEventListeners = function(){
    var self = this;

    this.ws.onopen = function(){
      self.onOpen();
    };
    this.ws.onclose = function(){
      self.onClose();
    };
    this.ws.onmessage = function(ev){
      self.onData(ev.data);
    };
    this.ws.onerror = function(e){
      self.onError('websocket error', e);
    };
  };

  /**
   * Override `onData` to use a timer on iOS.
   * See: https://gist.github.com/mloughran/2052006
   *
   * @api private
   */

  if ('undefined' != typeof navigator
      && /iPad|iPhone|iPod/i.test(navigator.userAgent)) {
    WS.prototype.onData = function(data){
      var self = this;
      setTimeout(function(){
        Transport.prototype.onData.call(self, data);
      }, 0);
    };
  }

  /**
   * Writes data to socket.
   *
   * @param {Array} array of packets.
   * @api private
   */

  WS.prototype.write = function(packets){
    var self = this;
    this.writable = false;
    // encodePacket efficient as it uses WS framing
    // no need for encodePayload
    for (var i = 0, l = packets.length; i < l; i++) {
      parser.encodePacket(packets[i], this.supportsBinary, function(data) {
        //Sometimes the websocket has already been closed but the browser didn't
        //have a chance of informing us about it yet, in that case send will
        //throw an error
        try {
          self.ws.send(data);
        } catch (e){
          debug('websocket closed before onclose event');
        }
      });
    }

    function ondrain() {
      self.writable = true;
      self.emit('drain');
    }
    // fake drain
    // defer to next tick to allow Socket to clear writeBuffer
    setTimeout(ondrain, 0);
  };

  /**
   * Called upon close
   *
   * @api private
   */

  WS.prototype.onClose = function(){
    Transport.prototype.onClose.call(this);
  };

  /**
   * Closes socket.
   *
   * @api private
   */

  WS.prototype.doClose = function(){
    if (typeof this.ws !== 'undefined') {
      this.ws.close();
    }
  };

  /**
   * Generates uri for connection.
   *
   * @api private
   */

  WS.prototype.uri = function(){
    var query = this.query || {};
    var schema = this.secure ? 'wss' : 'ws';
    var port = '';

    // avoid port if default for schema
    if (this.port && (('wss' == schema && this.port != 443)
                      || ('ws' == schema && this.port != 80))) {
      port = ':' + this.port;
    }

    // append timestamp to URI
    if (this.timestampRequests) {
      query[this.timestampParam] = +new Date;
    }

    // communicate binary support capabilities
    if (!this.supportsBinary) {
      query.b64 = 1;
    }

    query = parseqs.encode(query);

    // prepend ? to query
    if (query.length) {
      query = '?' + query;
    }

    return schema + '://' + this.hostname + port + this.path + query;
  };

  /**
   * Feature detection for WebSocket.
   *
   * @return {Boolean} whether this transport is available.
   * @api public
   */

  WS.prototype.check = function(){
    return !!WebSocket && !('__initialize' in WebSocket && this.name === WS.prototype.name);
  };

},{"../transport":14,"component-inherit":21,"debug":22,"engine.io-parser":25,"parseqs":33,"ws":35}],20:[function(_dereq_,module,exports){
// browser shim for xmlhttprequest module
  var hasCORS = _dereq_('has-cors');

  module.exports = function(opts) {
    var xdomain = opts.xdomain;

    // scheme must be same when usign XDomainRequest
    // http://blogs.msdn.com/b/ieinternals/archive/2010/05/13/xdomainrequest-restrictions-limitations-and-workarounds.aspx
    var xscheme = opts.xscheme;

    // XDomainRequest has a flow of not sending cookie, therefore it should be disabled as a default.
    // https://github.com/Automattic/engine.io-client/pull/217
    var enablesXDR = opts.enablesXDR;

    // XMLHttpRequest can be disabled on IE
    try {
      if ('undefined' != typeof XMLHttpRequest && (!xdomain || hasCORS)) {
        return new XMLHttpRequest();
      }
    } catch (e) { }

    // Use XDomainRequest for IE8 if enablesXDR is true
    // because loading bar keeps flashing when using jsonp-polling
    // https://github.com/yujiosaka/socke.io-ie8-loading-example
    try {
      if ('undefined' != typeof XDomainRequest && !xscheme && enablesXDR) {
        return new XDomainRequest();
      }
    } catch (e) { }

    if (!xdomain) {
      try {
        return new ActiveXObject('Microsoft.XMLHTTP');
      } catch(e) { }
    }
  }

},{"has-cors":38}],21:[function(_dereq_,module,exports){

  module.exports = function(a, b){
    var fn = function(){};
    fn.prototype = b.prototype;
    a.prototype = new fn;
    a.prototype.constructor = a;
  };
},{}],22:[function(_dereq_,module,exports){

  /**
   * This is the web browser implementation of `debug()`.
   *
   * Expose `debug()` as the module.
   */

  exports = module.exports = _dereq_('./debug');
  exports.log = log;
  exports.formatArgs = formatArgs;
  exports.save = save;
  exports.load = load;
  exports.useColors = useColors;

  /**
   * Colors.
   */

  exports.colors = [
    'lightseagreen',
    'forestgreen',
    'goldenrod',
    'dodgerblue',
    'darkorchid',
    'crimson'
  ];

  /**
   * Currently only WebKit-based Web Inspectors, Firefox >= v31,
   * and the Firebug extension (any Firefox version) are known
   * to support "%c" CSS customizations.
   *
   * TODO: add a `localStorage` variable to explicitly enable/disable colors
   */

  function useColors() {
    // is webkit? http://stackoverflow.com/a/16459606/376773
    return ('WebkitAppearance' in document.documentElement.style) ||
           // is firebug? http://stackoverflow.com/a/398120/376773
           (window.console && (console.firebug || (console.exception && console.table))) ||
           // is firefox >= v31?
           // https://developer.mozilla.org/en-US/docs/Tools/Web_Console#Styling_messages
           (navigator.userAgent.toLowerCase().match(/firefox\/(\d+)/) && parseInt(RegExp.$1, 10) >= 31);
  }

  /**
   * Map %j to `JSON.stringify()`, since no Web Inspectors do that by default.
   */

  exports.formatters.j = function(v) {
    return JSON.stringify(v);
  };


  /**
   * Colorize log arguments if enabled.
   *
   * @api public
   */

  function formatArgs() {
    var args = arguments;
    var useColors = this.useColors;

    args[0] = (useColors ? '%c' : '')
              + this.namespace
              + (useColors ? ' %c' : ' ')
              + args[0]
              + (useColors ? '%c ' : ' ')
              + '+' + exports.humanize(this.diff);

    if (!useColors) return args;

    var c = 'color: ' + this.color;
    args = [args[0], c, 'color: inherit'].concat(Array.prototype.slice.call(args, 1));

    // the final "%c" is somewhat tricky, because there could be other
    // arguments passed either before or after the %c, so we need to
    // figure out the correct index to insert the CSS into
    var index = 0;
    var lastC = 0;
    args[0].replace(/%[a-z%]/g, function(match) {
      if ('%%' === match) return;
      index++;
      if ('%c' === match) {
        // we only are interested in the *last* %c
        // (the user may have provided their own)
        lastC = index;
      }
    });

    args.splice(lastC, 0, c);
    return args;
  }

  /**
   * Invokes `console.log()` when available.
   * No-op when `console.log` is not a "function".
   *
   * @api public
   */

  function log() {
    // This hackery is required for IE8,
    // where the `console.log` function doesn't have 'apply'
    return 'object' == typeof console
           && 'function' == typeof console.log
           && Function.prototype.apply.call(console.log, console, arguments);
  }

  /**
   * Save `namespaces`.
   *
   * @param {String} namespaces
   * @api private
   */

  function save(namespaces) {
    try {
      if (null == namespaces) {
        localStorage.removeItem('debug');
      } else {
        localStorage.debug = namespaces;
      }
    } catch(e) {}
  }

  /**
   * Load `namespaces`.
   *
   * @return {String} returns the previously persisted debug modes
   * @api private
   */

  function load() {
    var r;
    try {
      r = localStorage.debug;
    } catch(e) {}
    return r;
  }

  /**
   * Enable namespaces listed in `localStorage.debug` initially.
   */

  exports.enable(load());

},{"./debug":23}],23:[function(_dereq_,module,exports){

  /**
   * This is the common logic for both the Node.js and web browser
   * implementations of `debug()`.
   *
   * Expose `debug()` as the module.
   */

  exports = module.exports = debug;
  exports.coerce = coerce;
  exports.disable = disable;
  exports.enable = enable;
  exports.enabled = enabled;
  exports.humanize = _dereq_('ms');

  /**
   * The currently active debug mode names, and names to skip.
   */

  exports.names = [];
  exports.skips = [];

  /**
   * Map of special "%n" handling functions, for the debug "format" argument.
   *
   * Valid key names are a single, lowercased letter, i.e. "n".
   */

  exports.formatters = {};

  /**
   * Previously assigned color.
   */

  var prevColor = 0;

  /**
   * Previous log timestamp.
   */

  var prevTime;

  /**
   * Select a color.
   *
   * @return {Number}
   * @api private
   */

  function selectColor() {
    return exports.colors[prevColor++ % exports.colors.length];
  }

  /**
   * Create a debugger with the given `namespace`.
   *
   * @param {String} namespace
   * @return {Function}
   * @api public
   */

  function debug(namespace) {

    // define the `disabled` version
    function disabled() {
    }
    disabled.enabled = false;

    // define the `enabled` version
    function enabled() {

      var self = enabled;

      // set `diff` timestamp
      var curr = +new Date();
      var ms = curr - (prevTime || curr);
      self.diff = ms;
      self.prev = prevTime;
      self.curr = curr;
      prevTime = curr;

      // add the `color` if not set
      if (null == self.useColors) self.useColors = exports.useColors();
      if (null == self.color && self.useColors) self.color = selectColor();

      var args = Array.prototype.slice.call(arguments);

      args[0] = exports.coerce(args[0]);

      if ('string' !== typeof args[0]) {
        // anything else let's inspect with %o
        args = ['%o'].concat(args);
      }

      // apply any `formatters` transformations
      var index = 0;
      args[0] = args[0].replace(/%([a-z%])/g, function(match, format) {
        // if we encounter an escaped % then don't increase the array index
        if (match === '%%') return match;
        index++;
        var formatter = exports.formatters[format];
        if ('function' === typeof formatter) {
          var val = args[index];
          match = formatter.call(self, val);

          // now we need to remove `args[index]` since it's inlined in the `format`
          args.splice(index, 1);
          index--;
        }
        return match;
      });

      if ('function' === typeof exports.formatArgs) {
        args = exports.formatArgs.apply(self, args);
      }
      var logFn = enabled.log || exports.log || console.log.bind(console);
      logFn.apply(self, args);
    }
    enabled.enabled = true;

    var fn = exports.enabled(namespace) ? enabled : disabled;

    fn.namespace = namespace;

    return fn;
  }

  /**
   * Enables a debug mode by namespaces. This can include modes
   * separated by a colon and wildcards.
   *
   * @param {String} namespaces
   * @api public
   */

  function enable(namespaces) {
    exports.save(namespaces);

    var split = (namespaces || '').split(/[\s,]+/);
    var len = split.length;

    for (var i = 0; i < len; i++) {
      if (!split[i]) continue; // ignore empty strings
      namespaces = split[i].replace(/\*/g, '.*?');
      if (namespaces[0] === '-') {
        exports.skips.push(new RegExp('^' + namespaces.substr(1) + '$'));
      } else {
        exports.names.push(new RegExp('^' + namespaces + '$'));
      }
    }
  }

  /**
   * Disable debug output.
   *
   * @api public
   */

  function disable() {
    exports.enable('');
  }

  /**
   * Returns true if the given mode name is enabled, false otherwise.
   *
   * @param {String} name
   * @return {Boolean}
   * @api public
   */

  function enabled(name) {
    var i, len;
    for (i = 0, len = exports.skips.length; i < len; i++) {
      if (exports.skips[i].test(name)) {
        return false;
      }
    }
    for (i = 0, len = exports.names.length; i < len; i++) {
      if (exports.names[i].test(name)) {
        return true;
      }
    }
    return false;
  }

  /**
   * Coerce `val`.
   *
   * @param {Mixed} val
   * @return {Mixed}
   * @api private
   */

  function coerce(val) {
    if (val instanceof Error) return val.stack || val.message;
    return val;
  }

},{"ms":24}],24:[function(_dereq_,module,exports){
  /**
   * Helpers.
   */

  var s = 1000;
  var m = s * 60;
  var h = m * 60;
  var d = h * 24;
  var y = d * 365.25;

  /**
   * Parse or format the given `val`.
   *
   * Options:
   *
   *  - `long` verbose formatting [false]
   *
   * @param {String|Number} val
   * @param {Object} options
   * @return {String|Number}
   * @api public
   */

  module.exports = function(val, options){
    options = options || {};
    if ('string' == typeof val) return parse(val);
    return options.long
        ? long(val)
        : short(val);
  };

  /**
   * Parse the given `str` and return milliseconds.
   *
   * @param {String} str
   * @return {Number}
   * @api private
   */

  function parse(str) {
    var match = /^((?:\d+)?\.?\d+) *(ms|seconds?|s|minutes?|m|hours?|h|days?|d|years?|y)?$/i.exec(str);
    if (!match) return;
    var n = parseFloat(match[1]);
    var type = (match[2] || 'ms').toLowerCase();
    switch (type) {
      case 'years':
      case 'year':
      case 'y':
        return n * y;
      case 'days':
      case 'day':
      case 'd':
        return n * d;
      case 'hours':
      case 'hour':
      case 'h':
        return n * h;
      case 'minutes':
      case 'minute':
      case 'm':
        return n * m;
      case 'seconds':
      case 'second':
      case 's':
        return n * s;
      case 'ms':
        return n;
    }
  }

  /**
   * Short format for `ms`.
   *
   * @param {Number} ms
   * @return {String}
   * @api private
   */

  function short(ms) {
    if (ms >= d) return Math.round(ms / d) + 'd';
    if (ms >= h) return Math.round(ms / h) + 'h';
    if (ms >= m) return Math.round(ms / m) + 'm';
    if (ms >= s) return Math.round(ms / s) + 's';
    return ms + 'ms';
  }

  /**
   * Long format for `ms`.
   *
   * @param {Number} ms
   * @return {String}
   * @api private
   */

  function long(ms) {
    return plural(ms, d, 'day')
           || plural(ms, h, 'hour')
           || plural(ms, m, 'minute')
           || plural(ms, s, 'second')
           || ms + ' ms';
  }

  /**
   * Pluralization helper.
   */

  function plural(ms, n, name) {
    if (ms < n) return;
    if (ms < n * 1.5) return Math.floor(ms / n) + ' ' + name;
    return Math.ceil(ms / n) + ' ' + name + 's';
  }

},{}],25:[function(_dereq_,module,exports){
  (function (global){
    /**
     * Module dependencies.
     */

    var keys = _dereq_('./keys');
    var hasBinary = _dereq_('has-binary');
    var sliceBuffer = _dereq_('arraybuffer.slice');
    var base64encoder = _dereq_('base64-arraybuffer');
    var after = _dereq_('after');
    var utf8 = _dereq_('utf8');

    /**
     * Check if we are running an android browser. That requires us to use
     * ArrayBuffer with polling transports...
     *
     * http://ghinda.net/jpeg-blob-ajax-android/
     */

    var isAndroid = navigator.userAgent.match(/Android/i);

    /**
     * Check if we are running in PhantomJS.
     * Uploading a Blob with PhantomJS does not work correctly, as reported here:
     * https://github.com/ariya/phantomjs/issues/11395
     * @type boolean
     */
    var isPhantomJS = /PhantomJS/i.test(navigator.userAgent);

    /**
     * When true, avoids using Blobs to encode payloads.
     * @type boolean
     */
    var dontSendBlobs = isAndroid || isPhantomJS;

    /**
     * Current protocol version.
     */

    exports.protocol = 3;

    /**
     * Packet types.
     */

    var packets = exports.packets = {
      open:     0    // non-ws
      , close:    1    // non-ws
      , ping:     2
      , pong:     3
      , message:  4
      , upgrade:  5
      , noop:     6
    };

    var packetslist = keys(packets);

    /**
     * Premade error packet.
     */

    var err = { type: 'error', data: 'parser error' };

    /**
     * Create a blob api even for blob builder when vendor prefixes exist
     */

    var Blob = _dereq_('blob');

    /**
     * Encodes a packet.
     *
     *     <packet type id> [ <data> ]
     *
     * Example:
     *
     *     5hello world
     *     3
     *     4
     *
     * Binary is encoded in an identical principle
     *
     * @api private
     */

    exports.encodePacket = function (packet, supportsBinary, utf8encode, callback) {
      if ('function' == typeof supportsBinary) {
        callback = supportsBinary;
        supportsBinary = false;
      }

      if ('function' == typeof utf8encode) {
        callback = utf8encode;
        utf8encode = null;
      }

      var data = (packet.data === undefined)
          ? undefined
          : packet.data.buffer || packet.data;

      if (global.ArrayBuffer && data instanceof ArrayBuffer) {
        return encodeArrayBuffer(packet, supportsBinary, callback);
      } else if (Blob && data instanceof global.Blob) {
        return encodeBlob(packet, supportsBinary, callback);
      }

      // might be an object with { base64: true, data: dataAsBase64String }
      if (data && data.base64) {
        return encodeBase64Object(packet, callback);
      }

      // Sending data as a utf-8 string
      var encoded = packets[packet.type];

      // data fragment is optional
      if (undefined !== packet.data) {
        encoded += utf8encode ? utf8.encode(String(packet.data)) : String(packet.data);
      }

      return callback('' + encoded);

    };

    function encodeBase64Object(packet, callback) {
      // packet data is an object { base64: true, data: dataAsBase64String }
      var message = 'b' + exports.packets[packet.type] + packet.data.data;
      return callback(message);
    }

    /**
     * Encode packet helpers for binary types
     */

    function encodeArrayBuffer(packet, supportsBinary, callback) {
      if (!supportsBinary) {
        return exports.encodeBase64Packet(packet, callback);
      }

      var data = packet.data;
      var contentArray = new Uint8Array(data);
      var resultBuffer = new Uint8Array(1 + data.byteLength);

      resultBuffer[0] = packets[packet.type];
      for (var i = 0; i < contentArray.length; i++) {
        resultBuffer[i+1] = contentArray[i];
      }

      return callback(resultBuffer.buffer);
    }

    function encodeBlobAsArrayBuffer(packet, supportsBinary, callback) {
      if (!supportsBinary) {
        return exports.encodeBase64Packet(packet, callback);
      }

      var fr = new FileReader();
      fr.onload = function() {
        packet.data = fr.result;
        exports.encodePacket(packet, supportsBinary, true, callback);
      };
      return fr.readAsArrayBuffer(packet.data);
    }

    function encodeBlob(packet, supportsBinary, callback) {
      if (!supportsBinary) {
        return exports.encodeBase64Packet(packet, callback);
      }

      if (dontSendBlobs) {
        return encodeBlobAsArrayBuffer(packet, supportsBinary, callback);
      }

      var length = new Uint8Array(1);
      length[0] = packets[packet.type];
      var blob = new Blob([length.buffer, packet.data]);

      return callback(blob);
    }

    /**
     * Encodes a packet with binary data in a base64 string
     *
     * @param {Object} packet, has `type` and `data`
     * @return {String} base64 encoded message
     */

    exports.encodeBase64Packet = function(packet, callback) {
      var message = 'b' + exports.packets[packet.type];
      if (Blob && packet.data instanceof Blob) {
        var fr = new FileReader();
        fr.onload = function() {
          var b64 = fr.result.split(',')[1];
          callback(message + b64);
        };
        return fr.readAsDataURL(packet.data);
      }

      var b64data;
      try {
        b64data = String.fromCharCode.apply(null, new Uint8Array(packet.data));
      } catch (e) {
        // iPhone Safari doesn't let you apply with typed arrays
        var typed = new Uint8Array(packet.data);
        var basic = new Array(typed.length);
        for (var i = 0; i < typed.length; i++) {
          basic[i] = typed[i];
        }
        b64data = String.fromCharCode.apply(null, basic);
      }
      message += global.btoa(b64data);
      return callback(message);
    };

    /**
     * Decodes a packet. Changes format to Blob if requested.
     *
     * @return {Object} with `type` and `data` (if any)
     * @api private
     */

    exports.decodePacket = function (data, binaryType, utf8decode) {
      // String data
      if (typeof data == 'string' || data === undefined) {
        if (data.charAt(0) == 'b') {
          return exports.decodeBase64Packet(data.substr(1), binaryType);
        }

        if (utf8decode) {
          try {
            data = utf8.decode(data);
          } catch (e) {
            return err;
          }
        }
        var type = data.charAt(0);

        if (Number(type) != type || !packetslist[type]) {
          return err;
        }

        if (data.length > 1) {
          return { type: packetslist[type], data: data.substring(1) };
        } else {
          return { type: packetslist[type] };
        }
      }

      var asArray = new Uint8Array(data);
      var type = asArray[0];
      var rest = sliceBuffer(data, 1);
      if (Blob && binaryType === 'blob') {
        rest = new Blob([rest]);
      }
      return { type: packetslist[type], data: rest };
    };

    /**
     * Decodes a packet encoded in a base64 string
     *
     * @param {String} base64 encoded message
     * @return {Object} with `type` and `data` (if any)
     */

    exports.decodeBase64Packet = function(msg, binaryType) {
      var type = packetslist[msg.charAt(0)];
      if (!global.ArrayBuffer) {
        return { type: type, data: { base64: true, data: msg.substr(1) } };
      }

      var data = base64encoder.decode(msg.substr(1));

      if (binaryType === 'blob' && Blob) {
        data = new Blob([data]);
      }

      return { type: type, data: data };
    };

    /**
     * Encodes multiple messages (payload).
     *
     *     <length>:data
     *
     * Example:
     *
     *     11:hello world2:hi
     *
     * If any contents are binary, they will be encoded as base64 strings. Base64
     * encoded strings are marked with a b before the length specifier
     *
     * @param {Array} packets
     * @api private
     */

    exports.encodePayload = function (packets, supportsBinary, callback) {
      if (typeof supportsBinary == 'function') {
        callback = supportsBinary;
        supportsBinary = null;
      }

      var isBinary = hasBinary(packets);

      if (supportsBinary && isBinary) {
        if (Blob && !dontSendBlobs) {
          return exports.encodePayloadAsBlob(packets, callback);
        }

        return exports.encodePayloadAsArrayBuffer(packets, callback);
      }

      if (!packets.length) {
        return callback('0:');
      }

      function setLengthHeader(message) {
        return message.length + ':' + message;
      }

      function encodeOne(packet, doneCallback) {
        exports.encodePacket(packet, !isBinary ? false : supportsBinary, true, function(message) {
          doneCallback(null, setLengthHeader(message));
        });
      }

      map(packets, encodeOne, function(err, results) {
        return callback(results.join(''));
      });
    };

    /**
     * Async array map using after
     */

    function map(ary, each, done) {
      var result = new Array(ary.length);
      var next = after(ary.length, done);

      var eachWithIndex = function(i, el, cb) {
        each(el, function(error, msg) {
          result[i] = msg;
          cb(error, result);
        });
      };

      for (var i = 0; i < ary.length; i++) {
        eachWithIndex(i, ary[i], next);
      }
    }

    /*
     * Decodes data when a payload is maybe expected. Possible binary contents are
     * decoded from their base64 representation
     *
     * @param {String} data, callback method
     * @api public
     */

    exports.decodePayload = function (data, binaryType, callback) {
      if (typeof data != 'string') {
        return exports.decodePayloadAsBinary(data, binaryType, callback);
      }

      if (typeof binaryType === 'function') {
        callback = binaryType;
        binaryType = null;
      }

      var packet;
      if (data == '') {
        // parser error - ignoring payload
        return callback(err, 0, 1);
      }

      var length = ''
          , n, msg;

      for (var i = 0, l = data.length; i < l; i++) {
        var chr = data.charAt(i);

        if (':' != chr) {
          length += chr;
        } else {
          if ('' == length || (length != (n = Number(length)))) {
            // parser error - ignoring payload
            return callback(err, 0, 1);
          }

          msg = data.substr(i + 1, n);

          if (length != msg.length) {
            // parser error - ignoring payload
            return callback(err, 0, 1);
          }

          if (msg.length) {
            packet = exports.decodePacket(msg, binaryType, true);

            if (err.type == packet.type && err.data == packet.data) {
              // parser error in individual packet - ignoring payload
              return callback(err, 0, 1);
            }

            var ret = callback(packet, i + n, l);
            if (false === ret) return;
          }

          // advance cursor
          i += n;
          length = '';
        }
      }

      if (length != '') {
        // parser error - ignoring payload
        return callback(err, 0, 1);
      }

    };

    /**
     * Encodes multiple messages (payload) as binary.
     *
     * <1 = binary, 0 = string><number from 0-9><number from 0-9>[...]<number
     * 255><data>
     *
     * Example:
     * 1 3 255 1 2 3, if the binary contents are interpreted as 8 bit integers
     *
     * @param {Array} packets
     * @return {ArrayBuffer} encoded payload
     * @api private
     */

    exports.encodePayloadAsArrayBuffer = function(packets, callback) {
      if (!packets.length) {
        return callback(new ArrayBuffer(0));
      }

      function encodeOne(packet, doneCallback) {
        exports.encodePacket(packet, true, true, function(data) {
          return doneCallback(null, data);
        });
      }

      map(packets, encodeOne, function(err, encodedPackets) {
        var totalLength = encodedPackets.reduce(function(acc, p) {
          var len;
          if (typeof p === 'string'){
            len = p.length;
          } else {
            len = p.byteLength;
          }
          return acc + len.toString().length + len + 2; // string/binary identifier + separator = 2
        }, 0);

        var resultArray = new Uint8Array(totalLength);

        var bufferIndex = 0;
        encodedPackets.forEach(function(p) {
          var isString = typeof p === 'string';
          var ab = p;
          if (isString) {
            var view = new Uint8Array(p.length);
            for (var i = 0; i < p.length; i++) {
              view[i] = p.charCodeAt(i);
            }
            ab = view.buffer;
          }

          if (isString) { // not true binary
            resultArray[bufferIndex++] = 0;
          } else { // true binary
            resultArray[bufferIndex++] = 1;
          }

          var lenStr = ab.byteLength.toString();
          for (var i = 0; i < lenStr.length; i++) {
            resultArray[bufferIndex++] = parseInt(lenStr[i]);
          }
          resultArray[bufferIndex++] = 255;

          var view = new Uint8Array(ab);
          for (var i = 0; i < view.length; i++) {
            resultArray[bufferIndex++] = view[i];
          }
        });

        return callback(resultArray.buffer);
      });
    };

    /**
     * Encode as Blob
     */

    exports.encodePayloadAsBlob = function(packets, callback) {
      function encodeOne(packet, doneCallback) {
        exports.encodePacket(packet, true, true, function(encoded) {
          var binaryIdentifier = new Uint8Array(1);
          binaryIdentifier[0] = 1;
          if (typeof encoded === 'string') {
            var view = new Uint8Array(encoded.length);
            for (var i = 0; i < encoded.length; i++) {
              view[i] = encoded.charCodeAt(i);
            }
            encoded = view.buffer;
            binaryIdentifier[0] = 0;
          }

          var len = (encoded instanceof ArrayBuffer)
              ? encoded.byteLength
              : encoded.size;

          var lenStr = len.toString();
          var lengthAry = new Uint8Array(lenStr.length + 1);
          for (var i = 0; i < lenStr.length; i++) {
            lengthAry[i] = parseInt(lenStr[i]);
          }
          lengthAry[lenStr.length] = 255;

          if (Blob) {
            var blob = new Blob([binaryIdentifier.buffer, lengthAry.buffer, encoded]);
            doneCallback(null, blob);
          }
        });
      }

      map(packets, encodeOne, function(err, results) {
        return callback(new Blob(results));
      });
    };

    /*
     * Decodes data when a payload is maybe expected. Strings are decoded by
     * interpreting each byte as a key code for entries marked to start with 0. See
     * description of encodePayloadAsBinary
     *
     * @param {ArrayBuffer} data, callback method
     * @api public
     */

    exports.decodePayloadAsBinary = function (data, binaryType, callback) {
      if (typeof binaryType === 'function') {
        callback = binaryType;
        binaryType = null;
      }

      var bufferTail = data;
      var buffers = [];

      var numberTooLong = false;
      while (bufferTail.byteLength > 0) {
        var tailArray = new Uint8Array(bufferTail);
        var isString = tailArray[0] === 0;
        var msgLength = '';

        for (var i = 1; ; i++) {
          if (tailArray[i] == 255) break;

          if (msgLength.length > 310) {
            numberTooLong = true;
            break;
          }

          msgLength += tailArray[i];
        }

        if(numberTooLong) return callback(err, 0, 1);

        bufferTail = sliceBuffer(bufferTail, 2 + msgLength.length);
        msgLength = parseInt(msgLength);

        var msg = sliceBuffer(bufferTail, 0, msgLength);
        if (isString) {
          try {
            msg = String.fromCharCode.apply(null, new Uint8Array(msg));
          } catch (e) {
            // iPhone Safari doesn't let you apply to typed arrays
            var typed = new Uint8Array(msg);
            msg = '';
            for (var i = 0; i < typed.length; i++) {
              msg += String.fromCharCode(typed[i]);
            }
          }
        }

        buffers.push(msg);
        bufferTail = sliceBuffer(bufferTail, msgLength);
      }

      var total = buffers.length;
      buffers.forEach(function(buffer, i) {
        callback(exports.decodePacket(buffer, binaryType, true), i, total);
      });
    };

  }).call(this,typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
},{"./keys":26,"after":27,"arraybuffer.slice":28,"base64-arraybuffer":29,"blob":30,"has-binary":36,"utf8":31}],26:[function(_dereq_,module,exports){

  /**
   * Gets the keys for an object.
   *
   * @return {Array} keys
   * @api private
   */

  module.exports = Object.keys || function keys (obj){
        var arr = [];
        var has = Object.prototype.hasOwnProperty;

        for (var i in obj) {
          if (has.call(obj, i)) {
            arr.push(i);
          }
        }
        return arr;
      };

},{}],27:[function(_dereq_,module,exports){
  module.exports = after

  function after(count, callback, err_cb) {
    var bail = false
    err_cb = err_cb || noop
    proxy.count = count

    return (count === 0) ? callback() : proxy

    function proxy(err, result) {
      if (proxy.count <= 0) {
        throw new Error('after called too many times')
      }
      --proxy.count

      // after first error, rest are passed to err_cb
      if (err) {
        bail = true
        callback(err)
        // future error callbacks will go to error handler
        callback = err_cb
      } else if (proxy.count === 0 && !bail) {
        callback(null, result)
      }
    }
  }

  function noop() {}

},{}],28:[function(_dereq_,module,exports){
  /**
   * An abstraction for slicing an arraybuffer even when
   * ArrayBuffer.prototype.slice is not supported
   *
   * @api public
   */

  module.exports = function(arraybuffer, start, end) {
    var bytes = arraybuffer.byteLength;
    start = start || 0;
    end = end || bytes;

    if (arraybuffer.slice) { return arraybuffer.slice(start, end); }

    if (start < 0) { start += bytes; }
    if (end < 0) { end += bytes; }
    if (end > bytes) { end = bytes; }

    if (start >= bytes || start >= end || bytes === 0) {
      return new ArrayBuffer(0);
    }

    var abv = new Uint8Array(arraybuffer);
    var result = new Uint8Array(end - start);
    for (var i = start, ii = 0; i < end; i++, ii++) {
      result[ii] = abv[i];
    }
    return result.buffer;
  };

},{}],29:[function(_dereq_,module,exports){
  /*
   * base64-arraybuffer
   * https://github.com/niklasvh/base64-arraybuffer
   *
   * Copyright (c) 2012 Niklas von Hertzen
   * Licensed under the MIT license.
   */
  (function(chars){
    "use strict";

    exports.encode = function(arraybuffer) {
      var bytes = new Uint8Array(arraybuffer),
          i, len = bytes.length, base64 = "";

      for (i = 0; i < len; i+=3) {
        base64 += chars[bytes[i] >> 2];
        base64 += chars[((bytes[i] & 3) << 4) | (bytes[i + 1] >> 4)];
        base64 += chars[((bytes[i + 1] & 15) << 2) | (bytes[i + 2] >> 6)];
        base64 += chars[bytes[i + 2] & 63];
      }

      if ((len % 3) === 2) {
        base64 = base64.substring(0, base64.length - 1) + "=";
      } else if (len % 3 === 1) {
        base64 = base64.substring(0, base64.length - 2) + "==";
      }

      return base64;
    };

    exports.decode =  function(base64) {
      var bufferLength = base64.length * 0.75,
          len = base64.length, i, p = 0,
          encoded1, encoded2, encoded3, encoded4;

      if (base64[base64.length - 1] === "=") {
        bufferLength--;
        if (base64[base64.length - 2] === "=") {
          bufferLength--;
        }
      }

      var arraybuffer = new ArrayBuffer(bufferLength),
          bytes = new Uint8Array(arraybuffer);

      for (i = 0; i < len; i+=4) {
        encoded1 = chars.indexOf(base64[i]);
        encoded2 = chars.indexOf(base64[i+1]);
        encoded3 = chars.indexOf(base64[i+2]);
        encoded4 = chars.indexOf(base64[i+3]);

        bytes[p++] = (encoded1 << 2) | (encoded2 >> 4);
        bytes[p++] = ((encoded2 & 15) << 4) | (encoded3 >> 2);
        bytes[p++] = ((encoded3 & 3) << 6) | (encoded4 & 63);
      }

      return arraybuffer;
    };
  })("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/");

},{}],30:[function(_dereq_,module,exports){
  (function (global){
    /**
     * Create a blob builder even when vendor prefixes exist
     */

    var BlobBuilder = global.BlobBuilder
                      || global.WebKitBlobBuilder
                      || global.MSBlobBuilder
                      || global.MozBlobBuilder;

    /**
     * Check if Blob constructor is supported
     */

    var blobSupported = (function() {
      try {
        var a = new Blob(['hi']);
        return a.size === 2;
      } catch(e) {
        return false;
      }
    })();

    /**
     * Check if Blob constructor supports ArrayBufferViews
     * Fails in Safari 6, so we need to map to ArrayBuffers there.
     */

    var blobSupportsArrayBufferView = blobSupported && (function() {
          try {
            var b = new Blob([new Uint8Array([1,2])]);
            return b.size === 2;
          } catch(e) {
            return false;
          }
        })();

    /**
     * Check if BlobBuilder is supported
     */

    var blobBuilderSupported = BlobBuilder
                               && BlobBuilder.prototype.append
                               && BlobBuilder.prototype.getBlob;

    /**
     * Helper function that maps ArrayBufferViews to ArrayBuffers
     * Used by BlobBuilder constructor and old browsers that didn't
     * support it in the Blob constructor.
     */

    function mapArrayBufferViews(ary) {
      for (var i = 0; i < ary.length; i++) {
        var chunk = ary[i];
        if (chunk.buffer instanceof ArrayBuffer) {
          var buf = chunk.buffer;

          // if this is a subarray, make a copy so we only
          // include the subarray region from the underlying buffer
          if (chunk.byteLength !== buf.byteLength) {
            var copy = new Uint8Array(chunk.byteLength);
            copy.set(new Uint8Array(buf, chunk.byteOffset, chunk.byteLength));
            buf = copy.buffer;
          }

          ary[i] = buf;
        }
      }
    }

    function BlobBuilderConstructor(ary, options) {
      options = options || {};

      var bb = new BlobBuilder();
      mapArrayBufferViews(ary);

      for (var i = 0; i < ary.length; i++) {
        bb.append(ary[i]);
      }

      return (options.type) ? bb.getBlob(options.type) : bb.getBlob();
    };

    function BlobConstructor(ary, options) {
      mapArrayBufferViews(ary);
      return new Blob(ary, options || {});
    };

    module.exports = (function() {
      if (blobSupported) {
        return blobSupportsArrayBufferView ? global.Blob : BlobConstructor;
      } else if (blobBuilderSupported) {
        return BlobBuilderConstructor;
      } else {
        return undefined;
      }
    })();

  }).call(this,typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
},{}],31:[function(_dereq_,module,exports){
  (function (global){
    /*! https://mths.be/utf8js v2.0.0 by @mathias */
    ;(function(root) {

      // Detect free variables `exports`
      var freeExports = typeof exports == 'object' && exports;

      // Detect free variable `module`
      var freeModule = typeof module == 'object' && module &&
                       module.exports == freeExports && module;

      // Detect free variable `global`, from Node.js or Browserified code,
      // and use it as `root`
      var freeGlobal = typeof global == 'object' && global;
      if (freeGlobal.global === freeGlobal || freeGlobal.window === freeGlobal) {
        root = freeGlobal;
      }

      /*--------------------------------------------------------------------------*/

      var stringFromCharCode = String.fromCharCode;

      // Taken from https://mths.be/punycode
      function ucs2decode(string) {
        var output = [];
        var counter = 0;
        var length = string.length;
        var value;
        var extra;
        while (counter < length) {
          value = string.charCodeAt(counter++);
          if (value >= 0xD800 && value <= 0xDBFF && counter < length) {
            // high surrogate, and there is a next character
            extra = string.charCodeAt(counter++);
            if ((extra & 0xFC00) == 0xDC00) { // low surrogate
              output.push(((value & 0x3FF) << 10) + (extra & 0x3FF) + 0x10000);
            } else {
              // unmatched surrogate; only append this code unit, in case the next
              // code unit is the high surrogate of a surrogate pair
              output.push(value);
              counter--;
            }
          } else {
            output.push(value);
          }
        }
        return output;
      }

      // Taken from https://mths.be/punycode
      function ucs2encode(array) {
        var length = array.length;
        var index = -1;
        var value;
        var output = '';
        while (++index < length) {
          value = array[index];
          if (value > 0xFFFF) {
            value -= 0x10000;
            output += stringFromCharCode(value >>> 10 & 0x3FF | 0xD800);
            value = 0xDC00 | value & 0x3FF;
          }
          output += stringFromCharCode(value);
        }
        return output;
      }

      function checkScalarValue(codePoint) {
        if (codePoint >= 0xD800 && codePoint <= 0xDFFF) {
          throw Error(
              'Lone surrogate U+' + codePoint.toString(16).toUpperCase() +
              ' is not a scalar value'
          );
        }
      }
      /*--------------------------------------------------------------------------*/

      function createByte(codePoint, shift) {
        return stringFromCharCode(((codePoint >> shift) & 0x3F) | 0x80);
      }

      function encodeCodePoint(codePoint) {
        if ((codePoint & 0xFFFFFF80) == 0) { // 1-byte sequence
          return stringFromCharCode(codePoint);
        }
        var symbol = '';
        if ((codePoint & 0xFFFFF800) == 0) { // 2-byte sequence
          symbol = stringFromCharCode(((codePoint >> 6) & 0x1F) | 0xC0);
        }
        else if ((codePoint & 0xFFFF0000) == 0) { // 3-byte sequence
          checkScalarValue(codePoint);
          symbol = stringFromCharCode(((codePoint >> 12) & 0x0F) | 0xE0);
          symbol += createByte(codePoint, 6);
        }
        else if ((codePoint & 0xFFE00000) == 0) { // 4-byte sequence
          symbol = stringFromCharCode(((codePoint >> 18) & 0x07) | 0xF0);
          symbol += createByte(codePoint, 12);
          symbol += createByte(codePoint, 6);
        }
        symbol += stringFromCharCode((codePoint & 0x3F) | 0x80);
        return symbol;
      }

      function utf8encode(string) {
        var codePoints = ucs2decode(string);
        var length = codePoints.length;
        var index = -1;
        var codePoint;
        var byteString = '';
        while (++index < length) {
          codePoint = codePoints[index];
          byteString += encodeCodePoint(codePoint);
        }
        return byteString;
      }

      /*--------------------------------------------------------------------------*/

      function readContinuationByte() {
        if (byteIndex >= byteCount) {
          throw Error('Invalid byte index');
        }

        var continuationByte = byteArray[byteIndex] & 0xFF;
        byteIndex++;

        if ((continuationByte & 0xC0) == 0x80) {
          return continuationByte & 0x3F;
        }

        // If we end up here, it’s not a continuation byte
        throw Error('Invalid continuation byte');
      }

      function decodeSymbol() {
        var byte1;
        var byte2;
        var byte3;
        var byte4;
        var codePoint;

        if (byteIndex > byteCount) {
          throw Error('Invalid byte index');
        }

        if (byteIndex == byteCount) {
          return false;
        }

        // Read first byte
        byte1 = byteArray[byteIndex] & 0xFF;
        byteIndex++;

        // 1-byte sequence (no continuation bytes)
        if ((byte1 & 0x80) == 0) {
          return byte1;
        }

        // 2-byte sequence
        if ((byte1 & 0xE0) == 0xC0) {
          var byte2 = readContinuationByte();
          codePoint = ((byte1 & 0x1F) << 6) | byte2;
          if (codePoint >= 0x80) {
            return codePoint;
          } else {
            throw Error('Invalid continuation byte');
          }
        }

        // 3-byte sequence (may include unpaired surrogates)
        if ((byte1 & 0xF0) == 0xE0) {
          byte2 = readContinuationByte();
          byte3 = readContinuationByte();
          codePoint = ((byte1 & 0x0F) << 12) | (byte2 << 6) | byte3;
          if (codePoint >= 0x0800) {
            checkScalarValue(codePoint);
            return codePoint;
          } else {
            throw Error('Invalid continuation byte');
          }
        }

        // 4-byte sequence
        if ((byte1 & 0xF8) == 0xF0) {
          byte2 = readContinuationByte();
          byte3 = readContinuationByte();
          byte4 = readContinuationByte();
          codePoint = ((byte1 & 0x0F) << 0x12) | (byte2 << 0x0C) |
                      (byte3 << 0x06) | byte4;
          if (codePoint >= 0x010000 && codePoint <= 0x10FFFF) {
            return codePoint;
          }
        }

        throw Error('Invalid UTF-8 detected');
      }

      var byteArray;
      var byteCount;
      var byteIndex;
      function utf8decode(byteString) {
        byteArray = ucs2decode(byteString);
        byteCount = byteArray.length;
        byteIndex = 0;
        var codePoints = [];
        var tmp;
        while ((tmp = decodeSymbol()) !== false) {
          codePoints.push(tmp);
        }
        return ucs2encode(codePoints);
      }

      /*--------------------------------------------------------------------------*/

      var utf8 = {
        'version': '2.0.0',
        'encode': utf8encode,
        'decode': utf8decode
      };

      // Some AMD build optimizers, like r.js, check for specific condition patterns
      // like the following:
      if (
          typeof define == 'function' &&
          typeof define.amd == 'object' &&
          define.amd
      ) {
        define(function() {
          return utf8;
        });
      }	else if (freeExports && !freeExports.nodeType) {
        if (freeModule) { // in Node.js or RingoJS v0.8.0+
          freeModule.exports = utf8;
        } else { // in Narwhal or RingoJS v0.7.0-
          var object = {};
          var hasOwnProperty = object.hasOwnProperty;
          for (var key in utf8) {
            hasOwnProperty.call(utf8, key) && (freeExports[key] = utf8[key]);
          }
        }
      } else { // in Rhino or a web browser
        root.utf8 = utf8;
      }

    }(this));

  }).call(this,typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
},{}],32:[function(_dereq_,module,exports){
  (function (global){
    /**
     * JSON parse.
     *
     * @see Based on jQuery#parseJSON (MIT) and JSON2
     * @api private
     */

    var rvalidchars = /^[\],:{}\s]*$/;
    var rvalidescape = /\\(?:["\\\/bfnrt]|u[0-9a-fA-F]{4})/g;
    var rvalidtokens = /"[^"\\\n\r]*"|true|false|null|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?/g;
    var rvalidbraces = /(?:^|:|,)(?:\s*\[)+/g;
    var rtrimLeft = /^\s+/;
    var rtrimRight = /\s+$/;

    module.exports = function parsejson(data) {
      if ('string' != typeof data || !data) {
        return null;
      }

      data = data.replace(rtrimLeft, '').replace(rtrimRight, '');

      // Attempt to parse using the native JSON parser first
      if (global.JSON && JSON.parse) {
        return JSON.parse(data);
      }

      if (rvalidchars.test(data.replace(rvalidescape, '@')
              .replace(rvalidtokens, ']')
              .replace(rvalidbraces, ''))) {
        return (new Function('return ' + data))();
      }
    };
  }).call(this,typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
},{}],33:[function(_dereq_,module,exports){
  /**
   * Compiles a querystring
   * Returns string representation of the object
   *
   * @param {Object}
   * @api private
   */

  exports.encode = function (obj) {
    var str = '';

    for (var i in obj) {
      if (obj.hasOwnProperty(i)) {
        if (str.length) str += '&';
        str += encodeURIComponent(i) + '=' + encodeURIComponent(obj[i]);
      }
    }

    return str;
  };

  /**
   * Parses a simple querystring into an object
   *
   * @param {String} qs
   * @api private
   */

  exports.decode = function(qs){
    var qry = {};
    var pairs = qs.split('&');
    for (var i = 0, l = pairs.length; i < l; i++) {
      var pair = pairs[i].split('=');
      qry[decodeURIComponent(pair[0])] = decodeURIComponent(pair[1]);
    }
    return qry;
  };

},{}],34:[function(_dereq_,module,exports){
  /**
   * Parses an URI
   *
   * @author Steven Levithan <stevenlevithan.com> (MIT license)
   * @api private
   */

  var re = /^(?:(?![^:@]+:[^:@\/]*@)(http|https|ws|wss):\/\/)?((?:(([^:@]*)(?::([^:@]*))?)?@)?((?:[a-f0-9]{0,4}:){2,7}[a-f0-9]{0,4}|[^:\/?#]*)(?::(\d*))?)(((\/(?:[^?#](?![^?#\/]*\.[^?#\/.]+(?:[?#]|$)))*\/?)?([^?#\/]*))(?:\?([^#]*))?(?:#(.*))?)/;

  var parts = [
    'source', 'protocol', 'authority', 'userInfo', 'user', 'password', 'host', 'port', 'relative', 'path', 'directory', 'file', 'query', 'anchor'
  ];

  module.exports = function parseuri(str) {
    var src = str,
        b = str.indexOf('['),
        e = str.indexOf(']');

    if (b != -1 && e != -1) {
      str = str.substring(0, b) + str.substring(b, e).replace(/:/g, ';') + str.substring(e, str.length);
    }

    var m = re.exec(str || ''),
        uri = {},
        i = 14;

    while (i--) {
      uri[parts[i]] = m[i] || '';
    }

    if (b != -1 && e != -1) {
      uri.source = src;
      uri.host = uri.host.substring(1, uri.host.length - 1).replace(/;/g, ':');
      uri.authority = uri.authority.replace('[', '').replace(']', '').replace(/;/g, ':');
      uri.ipv6uri = true;
    }

    return uri;
  };

},{}],35:[function(_dereq_,module,exports){

  /**
   * Module dependencies.
   */

  var global = (function() { return window; })();

  /**
   * WebSocket constructor.
   */

  var WebSocket = global.WebSocket || global.MozWebSocket;

  /**
   * Module exports.
   */

  module.exports = WebSocket ? ws : null;

  /**
   * WebSocket constructor.
   *
   * The third `opts` options object gets ignored in web browsers, since it's
   * non-standard, and throws a TypeError if passed to the constructor.
   * See: https://github.com/einaros/ws/issues/227
   *
   * @param {String} uri
   * @param {Array} protocols (optional)
   * @param {Object) opts (optional)
   * @api public
   */

  function ws(uri, protocols, opts) {
    var instance;
    if (protocols) {
      instance = new WebSocket(uri, protocols);
    } else {
      instance = new WebSocket(uri);
    }
    return instance;
  }

  if (WebSocket) ws.prototype = WebSocket.prototype;

},{}],36:[function(_dereq_,module,exports){
  (function (global){

    /*
     * Module requirements.
     */

    var isArray = _dereq_('isarray');

    /**
     * Module exports.
     */

    module.exports = hasBinary;

    /**
     * Checks for binary data.
     *
     * Right now only Buffer and ArrayBuffer are supported..
     *
     * @param {Object} anything
     * @api public
     */

    function hasBinary(data) {

      function _hasBinary(obj) {
        if (!obj) return false;

        if ( (global.Buffer && global.Buffer.isBuffer(obj)) ||
             (global.ArrayBuffer && obj instanceof ArrayBuffer) ||
             (global.Blob && obj instanceof Blob) ||
             (global.File && obj instanceof File)
        ) {
          return true;
        }

        if (isArray(obj)) {
          for (var i = 0; i < obj.length; i++) {
            if (_hasBinary(obj[i])) {
              return true;
            }
          }
        } else if (obj && 'object' == typeof obj) {
          if (obj.toJSON) {
            obj = obj.toJSON();
          }

          for (var key in obj) {
            if (Object.prototype.hasOwnProperty.call(obj, key) && _hasBinary(obj[key])) {
              return true;
            }
          }
        }

        return false;
      }

      return _hasBinary(data);
    }

  }).call(this,typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
},{"isarray":37}],37:[function(_dereq_,module,exports){
  module.exports = Array.isArray || function (arr) {
        return Object.prototype.toString.call(arr) == '[object Array]';
      };

},{}],38:[function(_dereq_,module,exports){

  /**
   * Module dependencies.
   */

  var global = _dereq_('global');

  /**
   * Module exports.
   *
   * Logic borrowed from Modernizr:
   *
   *   - https://github.com/Modernizr/Modernizr/blob/master/feature-detects/cors.js
   */

  try {
    module.exports = 'XMLHttpRequest' in global &&
                     'withCredentials' in new global.XMLHttpRequest();
  } catch (err) {
    // if XMLHttp support is disabled in IE then it will throw
    // when trying to create
    module.exports = false;
  }

},{"global":39}],39:[function(_dereq_,module,exports){

  /**
   * Returns `this`. Execute this without a "context" (i.e. without it being
   * attached to an object of the left-hand side), and `this` points to the
   * "global" scope of the current JS execution.
   */

  module.exports = (function () { return window; })();

},{}],40:[function(_dereq_,module,exports){

  var indexOf = [].indexOf;

  module.exports = function(arr, obj){
    if (indexOf) return arr.indexOf(obj);
    for (var i = 0; i < arr.length; ++i) {
      if (arr[i] === obj) return i;
    }
    return -1;
  };
},{}],41:[function(_dereq_,module,exports){

  /**
   * HOP ref.
   */

  var has = Object.prototype.hasOwnProperty;

  /**
   * Return own keys in `obj`.
   *
   * @param {Object} obj
   * @return {Array}
   * @api public
   */

  exports.keys = Object.keys || function(obj){
        var keys = [];
        for (var key in obj) {
          if (has.call(obj, key)) {
            keys.push(key);
          }
        }
        return keys;
      };

  /**
   * Return own values in `obj`.
   *
   * @param {Object} obj
   * @return {Array}
   * @api public
   */

  exports.values = function(obj){
    var vals = [];
    for (var key in obj) {
      if (has.call(obj, key)) {
        vals.push(obj[key]);
      }
    }
    return vals;
  };

  /**
   * Merge `b` into `a`.
   *
   * @param {Object} a
   * @param {Object} b
   * @return {Object} a
   * @api public
   */

  exports.merge = function(a, b){
    for (var key in b) {
      if (has.call(b, key)) {
        a[key] = b[key];
      }
    }
    return a;
  };

  /**
   * Return length of `obj`.
   *
   * @param {Object} obj
   * @return {Number}
   * @api public
   */

  exports.length = function(obj){
    return exports.keys(obj).length;
  };

  /**
   * Check if `obj` is empty.
   *
   * @param {Object} obj
   * @return {Boolean}
   * @api public
   */

  exports.isEmpty = function(obj){
    return 0 == exports.length(obj);
  };
},{}],42:[function(_dereq_,module,exports){
  /**
   * Parses an URI
   *
   * @author Steven Levithan <stevenlevithan.com> (MIT license)
   * @api private
   */

  var re = /^(?:(?![^:@]+:[^:@\/]*@)(http|https|ws|wss):\/\/)?((?:(([^:@]*)(?::([^:@]*))?)?@)?((?:[a-f0-9]{0,4}:){2,7}[a-f0-9]{0,4}|[^:\/?#]*)(?::(\d*))?)(((\/(?:[^?#](?![^?#\/]*\.[^?#\/.]+(?:[?#]|$)))*\/?)?([^?#\/]*))(?:\?([^#]*))?(?:#(.*))?)/;

  var parts = [
    'source', 'protocol', 'authority', 'userInfo', 'user', 'password', 'host'
    , 'port', 'relative', 'path', 'directory', 'file', 'query', 'anchor'
  ];

  module.exports = function parseuri(str) {
    var m = re.exec(str || '')
        , uri = {}
        , i = 14;

    while (i--) {
      uri[parts[i]] = m[i] || '';
    }

    return uri;
  };

},{}],43:[function(_dereq_,module,exports){
  (function (global){
    /*global Blob,File*/

    /**
     * Module requirements
     */

    var isArray = _dereq_('isarray');
    var isBuf = _dereq_('./is-buffer');

    /**
     * Replaces every Buffer | ArrayBuffer in packet with a numbered placeholder.
     * Anything with blobs or files should be fed through removeBlobs before coming
     * here.
     *
     * @param {Object} packet - socket.io event packet
     * @return {Object} with deconstructed packet and list of buffers
     * @api public
     */

    exports.deconstructPacket = function(packet){
      var buffers = [];
      var packetData = packet.data;

      function _deconstructPacket(data) {
        if (!data) return data;

        if (isBuf(data)) {
          var placeholder = { _placeholder: true, num: buffers.length };
          buffers.push(data);
          return placeholder;
        } else if (isArray(data)) {
          var newData = new Array(data.length);
          for (var i = 0; i < data.length; i++) {
            newData[i] = _deconstructPacket(data[i]);
          }
          return newData;
        } else if ('object' == typeof data && !(data instanceof Date)) {
          var newData = {};
          for (var key in data) {
            newData[key] = _deconstructPacket(data[key]);
          }
          return newData;
        }
        return data;
      }

      var pack = packet;
      pack.data = _deconstructPacket(packetData);
      pack.attachments = buffers.length; // number of binary 'attachments'
      return {packet: pack, buffers: buffers};
    };

    /**
     * Reconstructs a binary packet from its placeholder packet and buffers
     *
     * @param {Object} packet - event packet with placeholders
     * @param {Array} buffers - binary buffers to put in placeholder positions
     * @return {Object} reconstructed packet
     * @api public
     */

    exports.reconstructPacket = function(packet, buffers) {
      var curPlaceHolder = 0;

      function _reconstructPacket(data) {
        if (data && data._placeholder) {
          var buf = buffers[data.num]; // appropriate buffer (should be natural order anyway)
          return buf;
        } else if (isArray(data)) {
          for (var i = 0; i < data.length; i++) {
            data[i] = _reconstructPacket(data[i]);
          }
          return data;
        } else if (data && 'object' == typeof data) {
          for (var key in data) {
            data[key] = _reconstructPacket(data[key]);
          }
          return data;
        }
        return data;
      }

      packet.data = _reconstructPacket(packet.data);
      packet.attachments = undefined; // no longer useful
      return packet;
    };

    /**
     * Asynchronously removes Blobs or Files from data via
     * FileReader's readAsArrayBuffer method. Used before encoding
     * data as msgpack. Calls callback with the blobless data.
     *
     * @param {Object} data
     * @param {Function} callback
     * @api private
     */

    exports.removeBlobs = function(data, callback) {
      function _removeBlobs(obj, curKey, containingObject) {
        if (!obj) return obj;

        // convert any blob
        if ((global.Blob && obj instanceof Blob) ||
            (global.File && obj instanceof File)) {
          pendingBlobs++;

          // async filereader
          var fileReader = new FileReader();
          fileReader.onload = function() { // this.result == arraybuffer
            if (containingObject) {
              containingObject[curKey] = this.result;
            }
            else {
              bloblessData = this.result;
            }

            // if nothing pending its callback time
            if(! --pendingBlobs) {
              callback(bloblessData);
            }
          };

          fileReader.readAsArrayBuffer(obj); // blob -> arraybuffer
        } else if (isArray(obj)) { // handle array
          for (var i = 0; i < obj.length; i++) {
            _removeBlobs(obj[i], i, obj);
          }
        } else if (obj && 'object' == typeof obj && !isBuf(obj)) { // and object
          for (var key in obj) {
            _removeBlobs(obj[key], key, obj);
          }
        }
      }

      var pendingBlobs = 0;
      var bloblessData = data;
      _removeBlobs(bloblessData);
      if (!pendingBlobs) {
        callback(bloblessData);
      }
    };

  }).call(this,typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
},{"./is-buffer":45,"isarray":46}],44:[function(_dereq_,module,exports){

  /**
   * Module dependencies.
   */

  var debug = _dereq_('debug')('socket.io-parser');
  var json = _dereq_('json3');
  var isArray = _dereq_('isarray');
  var Emitter = _dereq_('component-emitter');
  var binary = _dereq_('./binary');
  var isBuf = _dereq_('./is-buffer');

  /**
   * Protocol version.
   *
   * @api public
   */

  exports.protocol = 4;

  /**
   * Packet types.
   *
   * @api public
   */

  exports.types = [
    'CONNECT',
    'DISCONNECT',
    'EVENT',
    'BINARY_EVENT',
    'ACK',
    'BINARY_ACK',
    'ERROR'
  ];

  /**
   * Packet type `connect`.
   *
   * @api public
   */

  exports.CONNECT = 0;

  /**
   * Packet type `disconnect`.
   *
   * @api public
   */

  exports.DISCONNECT = 1;

  /**
   * Packet type `event`.
   *
   * @api public
   */

  exports.EVENT = 2;

  /**
   * Packet type `ack`.
   *
   * @api public
   */

  exports.ACK = 3;

  /**
   * Packet type `error`.
   *
   * @api public
   */

  exports.ERROR = 4;

  /**
   * Packet type 'binary event'
   *
   * @api public
   */

  exports.BINARY_EVENT = 5;

  /**
   * Packet type `binary ack`. For acks with binary arguments.
   *
   * @api public
   */

  exports.BINARY_ACK = 6;

  /**
   * Encoder constructor.
   *
   * @api public
   */

  exports.Encoder = Encoder;

  /**
   * Decoder constructor.
   *
   * @api public
   */

  exports.Decoder = Decoder;

  /**
   * A socket.io Encoder instance
   *
   * @api public
   */

  function Encoder() {}

  /**
   * Encode a packet as a single string if non-binary, or as a
   * buffer sequence, depending on packet type.
   *
   * @param {Object} obj - packet object
   * @param {Function} callback - function to handle encodings (likely engine.write)
   * @return Calls callback with Array of encodings
   * @api public
   */

  Encoder.prototype.encode = function(obj, callback){
    debug('encoding packet %j', obj);

    if (exports.BINARY_EVENT == obj.type || exports.BINARY_ACK == obj.type) {
      encodeAsBinary(obj, callback);
    }
    else {
      var encoding = encodeAsString(obj);
      callback([encoding]);
    }
  };

  /**
   * Encode packet as string.
   *
   * @param {Object} packet
   * @return {String} encoded
   * @api private
   */

  function encodeAsString(obj) {
    var str = '';
    var nsp = false;

    // first is type
    str += obj.type;

    // attachments if we have them
    if (exports.BINARY_EVENT == obj.type || exports.BINARY_ACK == obj.type) {
      str += obj.attachments;
      str += '-';
    }

    // if we have a namespace other than `/`
    // we append it followed by a comma `,`
    if (obj.nsp && '/' != obj.nsp) {
      nsp = true;
      str += obj.nsp;
    }

    // immediately followed by the id
    if (null != obj.id) {
      if (nsp) {
        str += ',';
        nsp = false;
      }
      str += obj.id;
    }

    // json data
    if (null != obj.data) {
      if (nsp) str += ',';
      str += json.stringify(obj.data);
    }

    debug('encoded %j as %s', obj, str);
    return str;
  }

  /**
   * Encode packet as 'buffer sequence' by removing blobs, and
   * deconstructing packet into object with placeholders and
   * a list of buffers.
   *
   * @param {Object} packet
   * @return {Buffer} encoded
   * @api private
   */

  function encodeAsBinary(obj, callback) {

    function writeEncoding(bloblessData) {
      var deconstruction = binary.deconstructPacket(bloblessData);
      var pack = encodeAsString(deconstruction.packet);
      var buffers = deconstruction.buffers;

      buffers.unshift(pack); // add packet info to beginning of data list
      callback(buffers); // write all the buffers
    }

    binary.removeBlobs(obj, writeEncoding);
  }

  /**
   * A socket.io Decoder instance
   *
   * @return {Object} decoder
   * @api public
   */

  function Decoder() {
    this.reconstructor = null;
  }

  /**
   * Mix in `Emitter` with Decoder.
   */

  Emitter(Decoder.prototype);

  /**
   * Decodes an ecoded packet string into packet JSON.
   *
   * @param {String} obj - encoded packet
   * @return {Object} packet
   * @api public
   */

  Decoder.prototype.add = function(obj) {
    var packet;
    if ('string' == typeof obj) {
      packet = decodeString(obj);
      if (exports.BINARY_EVENT == packet.type || exports.BINARY_ACK == packet.type) { // binary packet's json
        this.reconstructor = new BinaryReconstructor(packet);

        // no attachments, labeled binary but no binary data to follow
        if (this.reconstructor.reconPack.attachments === 0) {
          this.emit('decoded', packet);
        }
      } else { // non-binary full packet
        this.emit('decoded', packet);
      }
    }
    else if (isBuf(obj) || obj.base64) { // raw binary data
      if (!this.reconstructor) {
        throw new Error('got binary data when not reconstructing a packet');
      } else {
        packet = this.reconstructor.takeBinaryData(obj);
        if (packet) { // received final buffer
          this.reconstructor = null;
          this.emit('decoded', packet);
        }
      }
    }
    else {
      throw new Error('Unknown type: ' + obj);
    }
  };

  /**
   * Decode a packet String (JSON data)
   *
   * @param {String} str
   * @return {Object} packet
   * @api private
   */

  function decodeString(str) {
    var p = {};
    var i = 0;

    // look up type
    p.type = Number(str.charAt(0));
    if (null == exports.types[p.type]) return error();

    // look up attachments if type binary
    if (exports.BINARY_EVENT == p.type || exports.BINARY_ACK == p.type) {
      var buf = '';
      while (str.charAt(++i) != '-') {
        buf += str.charAt(i);
        if (i == str.length) break;
      }
      if (buf != Number(buf) || str.charAt(i) != '-') {
        throw new Error('Illegal attachments');
      }
      p.attachments = Number(buf);
    }

    // look up namespace (if any)
    if ('/' == str.charAt(i + 1)) {
      p.nsp = '';
      while (++i) {
        var c = str.charAt(i);
        if (',' == c) break;
        p.nsp += c;
        if (i == str.length) break;
      }
    } else {
      p.nsp = '/';
    }

    // look up id
    var next = str.charAt(i + 1);
    if ('' !== next && Number(next) == next) {
      p.id = '';
      while (++i) {
        var c = str.charAt(i);
        if (null == c || Number(c) != c) {
          --i;
          break;
        }
        p.id += str.charAt(i);
        if (i == str.length) break;
      }
      p.id = Number(p.id);
    }

    // look up json data
    if (str.charAt(++i)) {
      try {
        p.data = json.parse(str.substr(i));
      } catch(e){
        return error();
      }
    }

    debug('decoded %s as %j', str, p);
    return p;
  }

  /**
   * Deallocates a parser's resources
   *
   * @api public
   */

  Decoder.prototype.destroy = function() {
    if (this.reconstructor) {
      this.reconstructor.finishedReconstruction();
    }
  };

  /**
   * A manager of a binary event's 'buffer sequence'. Should
   * be constructed whenever a packet of type BINARY_EVENT is
   * decoded.
   *
   * @param {Object} packet
   * @return {BinaryReconstructor} initialized reconstructor
   * @api private
   */

  function BinaryReconstructor(packet) {
    this.reconPack = packet;
    this.buffers = [];
  }

  /**
   * Method to be called when binary data received from connection
   * after a BINARY_EVENT packet.
   *
   * @param {Buffer | ArrayBuffer} binData - the raw binary data received
   * @return {null | Object} returns null if more binary data is expected or
   *   a reconstructed packet object if all buffers have been received.
   * @api private
   */

  BinaryReconstructor.prototype.takeBinaryData = function(binData) {
    this.buffers.push(binData);
    if (this.buffers.length == this.reconPack.attachments) { // done with buffer list
      var packet = binary.reconstructPacket(this.reconPack, this.buffers);
      this.finishedReconstruction();
      return packet;
    }
    return null;
  };

  /**
   * Cleans up binary packet reconstruction variables.
   *
   * @api private
   */

  BinaryReconstructor.prototype.finishedReconstruction = function() {
    this.reconPack = null;
    this.buffers = [];
  };

  function error(data){
    return {
      type: exports.ERROR,
      data: 'parser error'
    };
  }

},{"./binary":43,"./is-buffer":45,"component-emitter":9,"debug":10,"isarray":46,"json3":47}],45:[function(_dereq_,module,exports){
  (function (global){

    module.exports = isBuf;

    /**
     * Returns true if obj is a buffer or an arraybuffer.
     *
     * @api private
     */

    function isBuf(obj) {
      return (global.Buffer && global.Buffer.isBuffer(obj)) ||
             (global.ArrayBuffer && obj instanceof ArrayBuffer);
    }

  }).call(this,typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
},{}],46:[function(_dereq_,module,exports){
  module.exports=_dereq_(37)
},{}],47:[function(_dereq_,module,exports){
  /*! JSON v3.2.6 | http://bestiejs.github.io/json3 | Copyright 2012-2013, Kit Cambridge | http://kit.mit-license.org */
  ;(function (window) {
    // Convenience aliases.
    var getClass = {}.toString, isProperty, forEach, undef;

    // Detect the `define` function exposed by asynchronous module loaders. The
    // strict `define` check is necessary for compatibility with `r.js`.
    var isLoader = typeof define === "function" && define.amd;

    // Detect native implementations.
    var nativeJSON = typeof JSON == "object" && JSON;

    // Set up the JSON 3 namespace, preferring the CommonJS `exports` object if
    // available.
    var JSON3 = typeof exports == "object" && exports && !exports.nodeType && exports;

    if (JSON3 && nativeJSON) {
      // Explicitly delegate to the native `stringify` and `parse`
      // implementations in CommonJS environments.
      JSON3.stringify = nativeJSON.stringify;
      JSON3.parse = nativeJSON.parse;
    } else {
      // Export for web browsers, JavaScript engines, and asynchronous module
      // loaders, using the global `JSON` object if available.
      JSON3 = window.JSON = nativeJSON || {};
    }

    // Test the `Date#getUTC*` methods. Based on work by @Yaffle.
    var isExtended = new Date(-3509827334573292);
    try {
      // The `getUTCFullYear`, `Month`, and `Date` methods return nonsensical
      // results for certain dates in Opera >= 10.53.
      isExtended = isExtended.getUTCFullYear() == -109252 && isExtended.getUTCMonth() === 0 && isExtended.getUTCDate() === 1 &&
                   // Safari < 2.0.2 stores the internal millisecond time value correctly,
                   // but clips the values returned by the date methods to the range of
                   // signed 32-bit integers ([-2 ** 31, 2 ** 31 - 1]).
                   isExtended.getUTCHours() == 10 && isExtended.getUTCMinutes() == 37 && isExtended.getUTCSeconds() == 6 && isExtended.getUTCMilliseconds() == 708;
    } catch (exception) {}

    // Internal: Determines whether the native `JSON.stringify` and `parse`
    // implementations are spec-compliant. Based on work by Ken Snyder.
    function has(name) {
      if (has[name] !== undef) {
        // Return cached feature test result.
        return has[name];
      }

      var isSupported;
      if (name == "bug-string-char-index") {
        // IE <= 7 doesn't support accessing string characters using square
        // bracket notation. IE 8 only supports this for primitives.
        isSupported = "a"[0] != "a";
      } else if (name == "json") {
        // Indicates whether both `JSON.stringify` and `JSON.parse` are
        // supported.
        isSupported = has("json-stringify") && has("json-parse");
      } else {
        var value, serialized = '{"a":[1,true,false,null,"\\u0000\\b\\n\\f\\r\\t"]}';
        // Test `JSON.stringify`.
        if (name == "json-stringify") {
          var stringify = JSON3.stringify, stringifySupported = typeof stringify == "function" && isExtended;
          if (stringifySupported) {
            // A test function object with a custom `toJSON` method.
            (value = function () {
              return 1;
            }).toJSON = value;
            try {
              stringifySupported =
                // Firefox 3.1b1 and b2 serialize string, number, and boolean
                // primitives as object literals.
                  stringify(0) === "0" &&
                  // FF 3.1b1, b2, and JSON 2 serialize wrapped primitives as object
                  // literals.
                  stringify(new Number()) === "0" &&
                  stringify(new String()) == '""' &&
                  // FF 3.1b1, 2 throw an error if the value is `null`, `undefined`, or
                  // does not define a canonical JSON representation (this applies to
                  // objects with `toJSON` properties as well, *unless* they are nested
                  // within an object or array).
                  stringify(getClass) === undef &&
                  // IE 8 serializes `undefined` as `"undefined"`. Safari <= 5.1.7 and
                  // FF 3.1b3 pass this test.
                  stringify(undef) === undef &&
                  // Safari <= 5.1.7 and FF 3.1b3 throw `Error`s and `TypeError`s,
                  // respectively, if the value is omitted entirely.
                  stringify() === undef &&
                  // FF 3.1b1, 2 throw an error if the given value is not a number,
                  // string, array, object, Boolean, or `null` literal. This applies to
                  // objects with custom `toJSON` methods as well, unless they are nested
                  // inside object or array literals. YUI 3.0.0b1 ignores custom `toJSON`
                  // methods entirely.
                  stringify(value) === "1" &&
                  stringify([value]) == "[1]" &&
                  // Prototype <= 1.6.1 serializes `[undefined]` as `"[]"` instead of
                  // `"[null]"`.
                  stringify([undef]) == "[null]" &&
                  // YUI 3.0.0b1 fails to serialize `null` literals.
                  stringify(null) == "null" &&
                  // FF 3.1b1, 2 halts serialization if an array contains a function:
                  // `[1, true, getClass, 1]` serializes as "[1,true,],". FF 3.1b3
                  // elides non-JSON values from objects and arrays, unless they
                  // define custom `toJSON` methods.
                  stringify([undef, getClass, null]) == "[null,null,null]" &&
                  // Simple serialization test. FF 3.1b1 uses Unicode escape sequences
                  // where character escape codes are expected (e.g., `\b` => `\u0008`).
                  stringify({ "a": [value, true, false, null, "\x00\b\n\f\r\t"] }) == serialized &&
                  // FF 3.1b1 and b2 ignore the `filter` and `width` arguments.
                  stringify(null, value) === "1" &&
                  stringify([1, 2], null, 1) == "[\n 1,\n 2\n]" &&
                  // JSON 2, Prototype <= 1.7, and older WebKit builds incorrectly
                  // serialize extended years.
                  stringify(new Date(-8.64e15)) == '"-271821-04-20T00:00:00.000Z"' &&
                  // The milliseconds are optional in ES 5, but required in 5.1.
                  stringify(new Date(8.64e15)) == '"+275760-09-13T00:00:00.000Z"' &&
                  // Firefox <= 11.0 incorrectly serializes years prior to 0 as negative
                  // four-digit years instead of six-digit years. Credits: @Yaffle.
                  stringify(new Date(-621987552e5)) == '"-000001-01-01T00:00:00.000Z"' &&
                  // Safari <= 5.1.5 and Opera >= 10.53 incorrectly serialize millisecond
                  // values less than 1000. Credits: @Yaffle.
                  stringify(new Date(-1)) == '"1969-12-31T23:59:59.999Z"';
            } catch (exception) {
              stringifySupported = false;
            }
          }
          isSupported = stringifySupported;
        }
        // Test `JSON.parse`.
        if (name == "json-parse") {
          var parse = JSON3.parse;
          if (typeof parse == "function") {
            try {
              // FF 3.1b1, b2 will throw an exception if a bare literal is provided.
              // Conforming implementations should also coerce the initial argument to
              // a string prior to parsing.
              if (parse("0") === 0 && !parse(false)) {
                // Simple parsing test.
                value = parse(serialized);
                var parseSupported = value["a"].length == 5 && value["a"][0] === 1;
                if (parseSupported) {
                  try {
                    // Safari <= 5.1.2 and FF 3.1b1 allow unescaped tabs in strings.
                    parseSupported = !parse('"\t"');
                  } catch (exception) {}
                  if (parseSupported) {
                    try {
                      // FF 4.0 and 4.0.1 allow leading `+` signs and leading
                      // decimal points. FF 4.0, 4.0.1, and IE 9-10 also allow
                      // certain octal literals.
                      parseSupported = parse("01") !== 1;
                    } catch (exception) {}
                  }
                  if (parseSupported) {
                    try {
                      // FF 4.0, 4.0.1, and Rhino 1.7R3-R4 allow trailing decimal
                      // points. These environments, along with FF 3.1b1 and 2,
                      // also allow trailing commas in JSON objects and arrays.
                      parseSupported = parse("1.") !== 1;
                    } catch (exception) {}
                  }
                }
              }
            } catch (exception) {
              parseSupported = false;
            }
          }
          isSupported = parseSupported;
        }
      }
      return has[name] = !!isSupported;
    }

    if (!has("json")) {
      // Common `[[Class]]` name aliases.
      var functionClass = "[object Function]";
      var dateClass = "[object Date]";
      var numberClass = "[object Number]";
      var stringClass = "[object String]";
      var arrayClass = "[object Array]";
      var booleanClass = "[object Boolean]";

      // Detect incomplete support for accessing string characters by index.
      var charIndexBuggy = has("bug-string-char-index");

      // Define additional utility methods if the `Date` methods are buggy.
      if (!isExtended) {
        var floor = Math.floor;
        // A mapping between the months of the year and the number of days between
        // January 1st and the first of the respective month.
        var Months = [0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334];
        // Internal: Calculates the number of days between the Unix epoch and the
        // first day of the given month.
        var getDay = function (year, month) {
          return Months[month] + 365 * (year - 1970) + floor((year - 1969 + (month = +(month > 1))) / 4) - floor((year - 1901 + month) / 100) + floor((year - 1601 + month) / 400);
        };
      }

      // Internal: Determines if a property is a direct property of the given
      // object. Delegates to the native `Object#hasOwnProperty` method.
      if (!(isProperty = {}.hasOwnProperty)) {
        isProperty = function (property) {
          var members = {}, constructor;
          if ((members.__proto__ = null, members.__proto__ = {
                // The *proto* property cannot be set multiple times in recent
                // versions of Firefox and SeaMonkey.
                "toString": 1
              }, members).toString != getClass) {
            // Safari <= 2.0.3 doesn't implement `Object#hasOwnProperty`, but
            // supports the mutable *proto* property.
            isProperty = function (property) {
              // Capture and break the object's prototype chain (see section 8.6.2
              // of the ES 5.1 spec). The parenthesized expression prevents an
              // unsafe transformation by the Closure Compiler.
              var original = this.__proto__, result = property in (this.__proto__ = null, this);
              // Restore the original prototype chain.
              this.__proto__ = original;
              return result;
            };
          } else {
            // Capture a reference to the top-level `Object` constructor.
            constructor = members.constructor;
            // Use the `constructor` property to simulate `Object#hasOwnProperty` in
            // other environments.
            isProperty = function (property) {
              var parent = (this.constructor || constructor).prototype;
              return property in this && !(property in parent && this[property] === parent[property]);
            };
          }
          members = null;
          return isProperty.call(this, property);
        };
      }

      // Internal: A set of primitive types used by `isHostType`.
      var PrimitiveTypes = {
        'boolean': 1,
        'number': 1,
        'string': 1,
        'undefined': 1
      };

      // Internal: Determines if the given object `property` value is a
      // non-primitive.
      var isHostType = function (object, property) {
        var type = typeof object[property];
        return type == 'object' ? !!object[property] : !PrimitiveTypes[type];
      };

      // Internal: Normalizes the `for...in` iteration algorithm across
      // environments. Each enumerated key is yielded to a `callback` function.
      forEach = function (object, callback) {
        var size = 0, Properties, members, property;

        // Tests for bugs in the current environment's `for...in` algorithm. The
        // `valueOf` property inherits the non-enumerable flag from
        // `Object.prototype` in older versions of IE, Netscape, and Mozilla.
        (Properties = function () {
          this.valueOf = 0;
        }).prototype.valueOf = 0;

        // Iterate over a new instance of the `Properties` class.
        members = new Properties();
        for (property in members) {
          // Ignore all properties inherited from `Object.prototype`.
          if (isProperty.call(members, property)) {
            size++;
          }
        }
        Properties = members = null;

        // Normalize the iteration algorithm.
        if (!size) {
          // A list of non-enumerable properties inherited from `Object.prototype`.
          members = ["valueOf", "toString", "toLocaleString", "propertyIsEnumerable", "isPrototypeOf", "hasOwnProperty", "constructor"];
          // IE <= 8, Mozilla 1.0, and Netscape 6.2 ignore shadowed non-enumerable
          // properties.
          forEach = function (object, callback) {
            var isFunction = getClass.call(object) == functionClass, property, length;
            var hasProperty = !isFunction && typeof object.constructor != 'function' && isHostType(object, 'hasOwnProperty') ? object.hasOwnProperty : isProperty;
            for (property in object) {
              // Gecko <= 1.0 enumerates the `prototype` property of functions under
              // certain conditions; IE does not.
              if (!(isFunction && property == "prototype") && hasProperty.call(object, property)) {
                callback(property);
              }
            }
            // Manually invoke the callback for each non-enumerable property.
            for (length = members.length; property = members[--length]; hasProperty.call(object, property) && callback(property));
          };
        } else if (size == 2) {
          // Safari <= 2.0.4 enumerates shadowed properties twice.
          forEach = function (object, callback) {
            // Create a set of iterated properties.
            var members = {}, isFunction = getClass.call(object) == functionClass, property;
            for (property in object) {
              // Store each property name to prevent double enumeration. The
              // `prototype` property of functions is not enumerated due to cross-
              // environment inconsistencies.
              if (!(isFunction && property == "prototype") && !isProperty.call(members, property) && (members[property] = 1) && isProperty.call(object, property)) {
                callback(property);
              }
            }
          };
        } else {
          // No bugs detected; use the standard `for...in` algorithm.
          forEach = function (object, callback) {
            var isFunction = getClass.call(object) == functionClass, property, isConstructor;
            for (property in object) {
              if (!(isFunction && property == "prototype") && isProperty.call(object, property) && !(isConstructor = property === "constructor")) {
                callback(property);
              }
            }
            // Manually invoke the callback for the `constructor` property due to
            // cross-environment inconsistencies.
            if (isConstructor || isProperty.call(object, (property = "constructor"))) {
              callback(property);
            }
          };
        }
        return forEach(object, callback);
      };

      // Public: Serializes a JavaScript `value` as a JSON string. The optional
      // `filter` argument may specify either a function that alters how object and
      // array members are serialized, or an array of strings and numbers that
      // indicates which properties should be serialized. The optional `width`
      // argument may be either a string or number that specifies the indentation
      // level of the output.
      if (!has("json-stringify")) {
        // Internal: A map of control characters and their escaped equivalents.
        var Escapes = {
          92: "\\\\",
          34: '\\"',
          8: "\\b",
          12: "\\f",
          10: "\\n",
          13: "\\r",
          9: "\\t"
        };

        // Internal: Converts `value` into a zero-padded string such that its
        // length is at least equal to `width`. The `width` must be <= 6.
        var leadingZeroes = "000000";
        var toPaddedString = function (width, value) {
          // The `|| 0` expression is necessary to work around a bug in
          // Opera <= 7.54u2 where `0 == -0`, but `String(-0) !== "0"`.
          return (leadingZeroes + (value || 0)).slice(-width);
        };

        // Internal: Double-quotes a string `value`, replacing all ASCII control
        // characters (characters with code unit values between 0 and 31) with
        // their escaped equivalents. This is an implementation of the
        // `Quote(value)` operation defined in ES 5.1 section 15.12.3.
        var unicodePrefix = "\\u00";
        var quote = function (value) {
          var result = '"', index = 0, length = value.length, isLarge = length > 10 && charIndexBuggy, symbols;
          if (isLarge) {
            symbols = value.split("");
          }
          for (; index < length; index++) {
            var charCode = value.charCodeAt(index);
            // If the character is a control character, append its Unicode or
            // shorthand escape sequence; otherwise, append the character as-is.
            switch (charCode) {
              case 8: case 9: case 10: case 12: case 13: case 34: case 92:
              result += Escapes[charCode];
              break;
              default:
                if (charCode < 32) {
                  result += unicodePrefix + toPaddedString(2, charCode.toString(16));
                  break;
                }
                result += isLarge ? symbols[index] : charIndexBuggy ? value.charAt(index) : value[index];
            }
          }
          return result + '"';
        };

        // Internal: Recursively serializes an object. Implements the
        // `Str(key, holder)`, `JO(value)`, and `JA(value)` operations.
        var serialize = function (property, object, callback, properties, whitespace, indentation, stack) {
          var value, className, year, month, date, time, hours, minutes, seconds, milliseconds, results, element, index, length, prefix, result;
          try {
            // Necessary for host object support.
            value = object[property];
          } catch (exception) {}
          if (typeof value == "object" && value) {
            className = getClass.call(value);
            if (className == dateClass && !isProperty.call(value, "toJSON")) {
              if (value > -1 / 0 && value < 1 / 0) {
                // Dates are serialized according to the `Date#toJSON` method
                // specified in ES 5.1 section 15.9.5.44. See section 15.9.1.15
                // for the ISO 8601 date time string format.
                if (getDay) {
                  // Manually compute the year, month, date, hours, minutes,
                  // seconds, and milliseconds if the `getUTC*` methods are
                  // buggy. Adapted from @Yaffle's `date-shim` project.
                  date = floor(value / 864e5);
                  for (year = floor(date / 365.2425) + 1970 - 1; getDay(year + 1, 0) <= date; year++);
                  for (month = floor((date - getDay(year, 0)) / 30.42); getDay(year, month + 1) <= date; month++);
                  date = 1 + date - getDay(year, month);
                  // The `time` value specifies the time within the day (see ES
                  // 5.1 section 15.9.1.2). The formula `(A % B + B) % B` is used
                  // to compute `A modulo B`, as the `%` operator does not
                  // correspond to the `modulo` operation for negative numbers.
                  time = (value % 864e5 + 864e5) % 864e5;
                  // The hours, minutes, seconds, and milliseconds are obtained by
                  // decomposing the time within the day. See section 15.9.1.10.
                  hours = floor(time / 36e5) % 24;
                  minutes = floor(time / 6e4) % 60;
                  seconds = floor(time / 1e3) % 60;
                  milliseconds = time % 1e3;
                } else {
                  year = value.getUTCFullYear();
                  month = value.getUTCMonth();
                  date = value.getUTCDate();
                  hours = value.getUTCHours();
                  minutes = value.getUTCMinutes();
                  seconds = value.getUTCSeconds();
                  milliseconds = value.getUTCMilliseconds();
                }
                // Serialize extended years correctly.
                value = (year <= 0 || year >= 1e4 ? (year < 0 ? "-" : "+") + toPaddedString(6, year < 0 ? -year : year) : toPaddedString(4, year)) +
                        "-" + toPaddedString(2, month + 1) + "-" + toPaddedString(2, date) +
                        // Months, dates, hours, minutes, and seconds should have two
                        // digits; milliseconds should have three.
                        "T" + toPaddedString(2, hours) + ":" + toPaddedString(2, minutes) + ":" + toPaddedString(2, seconds) +
                        // Milliseconds are optional in ES 5.0, but required in 5.1.
                        "." + toPaddedString(3, milliseconds) + "Z";
              } else {
                value = null;
              }
            } else if (typeof value.toJSON == "function" && ((className != numberClass && className != stringClass && className != arrayClass) || isProperty.call(value, "toJSON"))) {
              // Prototype <= 1.6.1 adds non-standard `toJSON` methods to the
              // `Number`, `String`, `Date`, and `Array` prototypes. JSON 3
              // ignores all `toJSON` methods on these objects unless they are
              // defined directly on an instance.
              value = value.toJSON(property);
            }
          }
          if (callback) {
            // If a replacement function was provided, call it to obtain the value
            // for serialization.
            value = callback.call(object, property, value);
          }
          if (value === null) {
            return "null";
          }
          className = getClass.call(value);
          if (className == booleanClass) {
            // Booleans are represented literally.
            return "" + value;
          } else if (className == numberClass) {
            // JSON numbers must be finite. `Infinity` and `NaN` are serialized as
            // `"null"`.
            return value > -1 / 0 && value < 1 / 0 ? "" + value : "null";
          } else if (className == stringClass) {
            // Strings are double-quoted and escaped.
            return quote("" + value);
          }
          // Recursively serialize objects and arrays.
          if (typeof value == "object") {
            // Check for cyclic structures. This is a linear search; performance
            // is inversely proportional to the number of unique nested objects.
            for (length = stack.length; length--;) {
              if (stack[length] === value) {
                // Cyclic structures cannot be serialized by `JSON.stringify`.
                throw TypeError();
              }
            }
            // Add the object to the stack of traversed objects.
            stack.push(value);
            results = [];
            // Save the current indentation level and indent one additional level.
            prefix = indentation;
            indentation += whitespace;
            if (className == arrayClass) {
              // Recursively serialize array elements.
              for (index = 0, length = value.length; index < length; index++) {
                element = serialize(index, value, callback, properties, whitespace, indentation, stack);
                results.push(element === undef ? "null" : element);
              }
              result = results.length ? (whitespace ? "[\n" + indentation + results.join(",\n" + indentation) + "\n" + prefix + "]" : ("[" + results.join(",") + "]")) : "[]";
            } else {
              // Recursively serialize object members. Members are selected from
              // either a user-specified list of property names, or the object
              // itself.
              forEach(properties || value, function (property) {
                var element = serialize(property, value, callback, properties, whitespace, indentation, stack);
                if (element !== undef) {
                  // According to ES 5.1 section 15.12.3: "If `gap` {whitespace}
                  // is not the empty string, let `member` {quote(property) + ":"}
                  // be the concatenation of `member` and the `space` character."
                  // The "`space` character" refers to the literal space
                  // character, not the `space` {width} argument provided to
                  // `JSON.stringify`.
                  results.push(quote(property) + ":" + (whitespace ? " " : "") + element);
                }
              });
              result = results.length ? (whitespace ? "{\n" + indentation + results.join(",\n" + indentation) + "\n" + prefix + "}" : ("{" + results.join(",") + "}")) : "{}";
            }
            // Remove the object from the traversed object stack.
            stack.pop();
            return result;
          }
        };

        // Public: `JSON.stringify`. See ES 5.1 section 15.12.3.
        JSON3.stringify = function (source, filter, width) {
          var whitespace, callback, properties, className;
          if (typeof filter == "function" || typeof filter == "object" && filter) {
            if ((className = getClass.call(filter)) == functionClass) {
              callback = filter;
            } else if (className == arrayClass) {
              // Convert the property names array into a makeshift set.
              properties = {};
              for (var index = 0, length = filter.length, value; index < length; value = filter[index++], ((className = getClass.call(value)), className == stringClass || className == numberClass) && (properties[value] = 1));
            }
          }
          if (width) {
            if ((className = getClass.call(width)) == numberClass) {
              // Convert the `width` to an integer and create a string containing
              // `width` number of space characters.
              if ((width -= width % 1) > 0) {
                for (whitespace = "", width > 10 && (width = 10); whitespace.length < width; whitespace += " ");
              }
            } else if (className == stringClass) {
              whitespace = width.length <= 10 ? width : width.slice(0, 10);
            }
          }
          // Opera <= 7.54u2 discards the values associated with empty string keys
          // (`""`) only if they are used directly within an object member list
          // (e.g., `!("" in { "": 1})`).
          return serialize("", (value = {}, value[""] = source, value), callback, properties, whitespace, "", []);
        };
      }

      // Public: Parses a JSON source string.
      if (!has("json-parse")) {
        var fromCharCode = String.fromCharCode;

        // Internal: A map of escaped control characters and their unescaped
        // equivalents.
        var Unescapes = {
          92: "\\",
          34: '"',
          47: "/",
          98: "\b",
          116: "\t",
          110: "\n",
          102: "\f",
          114: "\r"
        };

        // Internal: Stores the parser state.
        var Index, Source;

        // Internal: Resets the parser state and throws a `SyntaxError`.
        var abort = function() {
          Index = Source = null;
          throw SyntaxError();
        };

        // Internal: Returns the next token, or `"$"` if the parser has reached
        // the end of the source string. A token may be a string, number, `null`
        // literal, or Boolean literal.
        var lex = function () {
          var source = Source, length = source.length, value, begin, position, isSigned, charCode;
          while (Index < length) {
            charCode = source.charCodeAt(Index);
            switch (charCode) {
              case 9: case 10: case 13: case 32:
              // Skip whitespace tokens, including tabs, carriage returns, line
              // feeds, and space characters.
              Index++;
              break;
              case 123: case 125: case 91: case 93: case 58: case 44:
              // Parse a punctuator token (`{`, `}`, `[`, `]`, `:`, or `,`) at
              // the current position.
              value = charIndexBuggy ? source.charAt(Index) : source[Index];
              Index++;
              return value;
              case 34:
                // `"` delimits a JSON string; advance to the next character and
                // begin parsing the string. String tokens are prefixed with the
                // sentinel `@` character to distinguish them from punctuators and
                // end-of-string tokens.
                for (value = "@", Index++; Index < length;) {
                  charCode = source.charCodeAt(Index);
                  if (charCode < 32) {
                    // Unescaped ASCII control characters (those with a code unit
                    // less than the space character) are not permitted.
                    abort();
                  } else if (charCode == 92) {
                    // A reverse solidus (`\`) marks the beginning of an escaped
                    // control character (including `"`, `\`, and `/`) or Unicode
                    // escape sequence.
                    charCode = source.charCodeAt(++Index);
                    switch (charCode) {
                      case 92: case 34: case 47: case 98: case 116: case 110: case 102: case 114:
                      // Revive escaped control characters.
                      value += Unescapes[charCode];
                      Index++;
                      break;
                      case 117:
                        // `\u` marks the beginning of a Unicode escape sequence.
                        // Advance to the first character and validate the
                        // four-digit code point.
                        begin = ++Index;
                        for (position = Index + 4; Index < position; Index++) {
                          charCode = source.charCodeAt(Index);
                          // A valid sequence comprises four hexdigits (case-
                          // insensitive) that form a single hexadecimal value.
                          if (!(charCode >= 48 && charCode <= 57 || charCode >= 97 && charCode <= 102 || charCode >= 65 && charCode <= 70)) {
                            // Invalid Unicode escape sequence.
                            abort();
                          }
                        }
                        // Revive the escaped character.
                        value += fromCharCode("0x" + source.slice(begin, Index));
                        break;
                      default:
                        // Invalid escape sequence.
                        abort();
                    }
                  } else {
                    if (charCode == 34) {
                      // An unescaped double-quote character marks the end of the
                      // string.
                      break;
                    }
                    charCode = source.charCodeAt(Index);
                    begin = Index;
                    // Optimize for the common case where a string is valid.
                    while (charCode >= 32 && charCode != 92 && charCode != 34) {
                      charCode = source.charCodeAt(++Index);
                    }
                    // Append the string as-is.
                    value += source.slice(begin, Index);
                  }
                }
                if (source.charCodeAt(Index) == 34) {
                  // Advance to the next character and return the revived string.
                  Index++;
                  return value;
                }
                // Unterminated string.
                abort();
              default:
                // Parse numbers and literals.
                begin = Index;
                // Advance past the negative sign, if one is specified.
                if (charCode == 45) {
                  isSigned = true;
                  charCode = source.charCodeAt(++Index);
                }
                // Parse an integer or floating-point value.
                if (charCode >= 48 && charCode <= 57) {
                  // Leading zeroes are interpreted as octal literals.
                  if (charCode == 48 && ((charCode = source.charCodeAt(Index + 1)), charCode >= 48 && charCode <= 57)) {
                    // Illegal octal literal.
                    abort();
                  }
                  isSigned = false;
                  // Parse the integer component.
                  for (; Index < length && ((charCode = source.charCodeAt(Index)), charCode >= 48 && charCode <= 57); Index++);
                  // Floats cannot contain a leading decimal point; however, this
                  // case is already accounted for by the parser.
                  if (source.charCodeAt(Index) == 46) {
                    position = ++Index;
                    // Parse the decimal component.
                    for (; position < length && ((charCode = source.charCodeAt(position)), charCode >= 48 && charCode <= 57); position++);
                    if (position == Index) {
                      // Illegal trailing decimal.
                      abort();
                    }
                    Index = position;
                  }
                  // Parse exponents. The `e` denoting the exponent is
                  // case-insensitive.
                  charCode = source.charCodeAt(Index);
                  if (charCode == 101 || charCode == 69) {
                    charCode = source.charCodeAt(++Index);
                    // Skip past the sign following the exponent, if one is
                    // specified.
                    if (charCode == 43 || charCode == 45) {
                      Index++;
                    }
                    // Parse the exponential component.
                    for (position = Index; position < length && ((charCode = source.charCodeAt(position)), charCode >= 48 && charCode <= 57); position++);
                    if (position == Index) {
                      // Illegal empty exponent.
                      abort();
                    }
                    Index = position;
                  }
                  // Coerce the parsed value to a JavaScript number.
                  return +source.slice(begin, Index);
                }
                // A negative sign may only precede numbers.
                if (isSigned) {
                  abort();
                }
                // `true`, `false`, and `null` literals.
                if (source.slice(Index, Index + 4) == "true") {
                  Index += 4;
                  return true;
                } else if (source.slice(Index, Index + 5) == "false") {
                  Index += 5;
                  return false;
                } else if (source.slice(Index, Index + 4) == "null") {
                  Index += 4;
                  return null;
                }
                // Unrecognized token.
                abort();
            }
          }
          // Return the sentinel `$` character if the parser has reached the end
          // of the source string.
          return "$";
        };

        // Internal: Parses a JSON `value` token.
        var get = function (value) {
          var results, hasMembers;
          if (value == "$") {
            // Unexpected end of input.
            abort();
          }
          if (typeof value == "string") {
            if ((charIndexBuggy ? value.charAt(0) : value[0]) == "@") {
              // Remove the sentinel `@` character.
              return value.slice(1);
            }
            // Parse object and array literals.
            if (value == "[") {
              // Parses a JSON array, returning a new JavaScript array.
              results = [];
              for (;; hasMembers || (hasMembers = true)) {
                value = lex();
                // A closing square bracket marks the end of the array literal.
                if (value == "]") {
                  break;
                }
                // If the array literal contains elements, the current token
                // should be a comma separating the previous element from the
                // next.
                if (hasMembers) {
                  if (value == ",") {
                    value = lex();
                    if (value == "]") {
                      // Unexpected trailing `,` in array literal.
                      abort();
                    }
                  } else {
                    // A `,` must separate each array element.
                    abort();
                  }
                }
                // Elisions and leading commas are not permitted.
                if (value == ",") {
                  abort();
                }
                results.push(get(value));
              }
              return results;
            } else if (value == "{") {
              // Parses a JSON object, returning a new JavaScript object.
              results = {};
              for (;; hasMembers || (hasMembers = true)) {
                value = lex();
                // A closing curly brace marks the end of the object literal.
                if (value == "}") {
                  break;
                }
                // If the object literal contains members, the current token
                // should be a comma separator.
                if (hasMembers) {
                  if (value == ",") {
                    value = lex();
                    if (value == "}") {
                      // Unexpected trailing `,` in object literal.
                      abort();
                    }
                  } else {
                    // A `,` must separate each object member.
                    abort();
                  }
                }
                // Leading commas are not permitted, object property names must be
                // double-quoted strings, and a `:` must separate each property
                // name and value.
                if (value == "," || typeof value != "string" || (charIndexBuggy ? value.charAt(0) : value[0]) != "@" || lex() != ":") {
                  abort();
                }
                results[value.slice(1)] = get(lex());
              }
              return results;
            }
            // Unexpected token encountered.
            abort();
          }
          return value;
        };

        // Internal: Updates a traversed object member.
        var update = function(source, property, callback) {
          var element = walk(source, property, callback);
          if (element === undef) {
            delete source[property];
          } else {
            source[property] = element;
          }
        };

        // Internal: Recursively traverses a parsed JSON object, invoking the
        // `callback` function for each value. This is an implementation of the
        // `Walk(holder, name)` operation defined in ES 5.1 section 15.12.2.
        var walk = function (source, property, callback) {
          var value = source[property], length;
          if (typeof value == "object" && value) {
            // `forEach` can't be used to traverse an array in Opera <= 8.54
            // because its `Object#hasOwnProperty` implementation returns `false`
            // for array indices (e.g., `![1, 2, 3].hasOwnProperty("0")`).
            if (getClass.call(value) == arrayClass) {
              for (length = value.length; length--;) {
                update(value, length, callback);
              }
            } else {
              forEach(value, function (property) {
                update(value, property, callback);
              });
            }
          }
          return callback.call(source, property, value);
        };

        // Public: `JSON.parse`. See ES 5.1 section 15.12.2.
        JSON3.parse = function (source, callback) {
          var result, value;
          Index = 0;
          Source = "" + source;
          result = get(lex());
          // If a JSON string contains multiple tokens, it is invalid.
          if (lex() != "$") {
            abort();
          }
          // Reset the parser state.
          Index = Source = null;
          return callback && getClass.call(callback) == functionClass ? walk((value = {}, value[""] = result, value), "", callback) : result;
        };
      }
    }

    // Export for asynchronous module loaders.
    if (isLoader) {
      define(function () {
        return JSON3;
      });
    }
  }(this));

},{}],48:[function(_dereq_,module,exports){
  module.exports = toArray

  function toArray(list, index) {
    var array = []

    index = index || 0

    for (var i = index || 0; i < list.length; i++) {
      array[i - index] = list[i]
    }

    return array
  }

},{}]},{},[1])
(1)
});